"Indicative" Plans and Unanswered Questions: What SAVE Learned at the Grange Farm Meeting

SAVE were out in full force at the Greater Cambridge Shared Planning (GCSP) meeting at Abington Primary School last week. We spoke directly to the planning team, studied the exhibition material and asked questions about water, transport, wastewater, access, employment and the separation between the proposed development and the Abingtons.

And if they didn't answer properly (which often they didn't!) we asked again.

One word came up repeatedly: "indicative." The published site map is formally described as an "Indicative Spatial Framework." (See below). Google the term and one explanation that surfaces is: "a rough sketch." Yes, the plan that could fundamentally alter the lives of our community is a rough sketch. Worrying, isn't it?!

The detailed masterplan, infrastructure arrangements and phasing are due to be developed later, after the plan has been signed off as "sound."

We walked away with the sense that Grange Farm is a vision. A government housing target. But many of the practical, logistical and financial measures needed to make it work remain unresolved or undesigned. There's very much an "it will all come out in the wash" vibe. And we're the mud.

Here are our key takeaways.

Let's start at the beginning. Planning for 50,000 new homes across Greater Cambridge began in 2019. Originally, the Hartree site on Cowley Road, a 48-hectare brownfield plot in North East Cambridge occupied by Anglian Water's wastewater treatment plant, was allocated for 5,600 homes.

The site looked like a planner's paradise: non-arable land, close to jobs and transport links. "It was an amazing site," one GCSP representative told SAVE at the meeting. The dealbreaker was the need to relocate the wastewater treatment works. The proposed move was initially estimated at approximately £220 million, but we were told that inflation and other pressures pushed the cost to around £500 million.

The Government withdrew funding in August 2025, wasting £80m in the process, and hey presto, all fingers pointed to Grange Farm: a fallback option in a six-year process, offered by Pampisford Estates, in spite the red flag from their own land assessments. Any wonder we call it a panic plan?!

From our meetings with Pippa Heylings, we also know Cowley Road was her preferred site. That makes sense: surely our local MP, who fervently defends our chalk aquifer and streams, could not support a development that threatens the ecological system she campaigns to protect?!

So, Cowley Road: preferred by planners and — seemingly — politicians, on brownfield land and close to transport. A question we asked: has anyone compared its cost with the full cost of making Grange Farm work, including CSET and its extension, highway improvements, water transfers, wastewater treatment and environmental mitigation? No comparative figure was provided. We were told only that the costs would be "substantial" and that the enormous costs such as water infrastructure would ultimately be funded through customers' bills.

We have found no published, comprehensive estimate of what it will cost to make Grange Farm deliverable. The Infrastructure Delivery Plan identifies a £30 million Grange Farm CSET extension, but leaves numerous essential costs, including active travel, access, mobility hubs and other infrastructure, as "TBC."

Following one of the hottest, driest summers on record, even the least climate-aware among us may suspect Mother Nature is a little angry about what we're doing to the planet.

Water is not just a community concern. It is a formal condition of the proposed allocation. Policy S/GF proposes approximately 4,500 homes from 2034, "subject to the necessary water infrastructure being available." It says planning conditions are likely to prevent occupation until the Grafham Transfer is operational, unless alternative water-supply headroom is secured.

The Grafham Transfer is essentially a giant pipe expected to supply Cambridge from around 2032. Its availability depends on another major project, the Grand Union Canal Transfer. Under that scheme, highly treated recycled water from the Midlands would travel through the canal network, reducing Affinity Water's reliance on Grafham and freeing capacity for Cambridge. But this is an interim arrangement. It is intended to support Cambridge until the proposed Fens Reservoir becomes available, currently anticipated in 2036/37.

Let's take a step back. Not a single reservoir has been built in this country since 1992. A recent BBC report, 'The Race to Stop England Running Out of Water,' said England's nine planned reservoirs would provide only around 7% of the additional water needed to help sort the drought challenge by 2055.

Environmental issues aside, what happens if any part of this chain slips? One planner told us that the first homes could be constructed but not occupied until the water needed to supply them was available: a potential ghost town on our doorstep. What developer in their right mind would take this financial risk?

When we asked how much water would be needed simply to build a development of this scale, and how much that would cost, there was no answer. So yes, mitigation is proposed – they've theoretically "solved" the issue with a giant pipe and a speculative reservoir. But Grange Farm's timetable depends on major water projects outside the developer's control.

• How many homes might be built before occupation is possible?
• Who carries the risk if the infrastructure is late, too expensive or provides insufficient capacity?

Once Grange Farm's predicted 10,800 occupants merrily arrive at their potentially waterless abodes, that water waste has to go somewhere!

Little Abington residents will no doubt be thrilled that the revised "Indicative Spatial Framework" shows a "Waste Water Recycling Option" near Fourwentways service station.

Before you stockpile nose pegs, even this is uncertain. At the meeting, we were told the land is owned by Pampisford Estates but sits outside the proposed development boundary.

We were also told they "...may use the Linton plant, or Sawston, or that future technology may allow wastewater to be handled on-site." That's a lot of maybes!

When we asked how a development of this scale could be planned without a confirmed wastewater solution, that famous word returned: the facility shown was indicative. Ah, we'll rest easy in our indicative beds!

The revised policy confirms that foul drainage and sewage disposal remain "to be explored and identified" through a future strategy prepared by the applicant. The location, technology, capacity, environmental effects, timetable and funding of an essential utility have not been fixed. Sounds like "positively prepared" planning to us!

Human waste aside, what happens when 4,500 homes are placed over the chalk aquifer that supplies 99% of Cambridge's drinking water?

A quick science lesson, if you concrete over a permeable sponge and pour water on it, the water would run off it, rather than absorb it. Apply that principle to the chalk aquifer and globally rare chalk streams around Grange Farm, and you have a significant run off problem. We were told runoff would be "managed through Sustainable Drainage Systems." But told at the same time, they have not yet been designed.

SuDS are required in principle; their location, capacity and design are left to the later masterplan, Integrated Water Management Plan and Water Cycle Strategy. The policy "recognises" the chalk stream, but it has not yet demonstrated that the effects of 4,500 homes can be safely mitigated.

Come 2035, as well as the possible fragrant whiff of wastewater during their family barbecues, Little Abington residents may be able to wave directly at their new neighbours - assuming they can see over the traffic jam on the A1307. More on that shortly.

Riddle us this: The exhibition banner told us:

"You said: The boundary is too close to the villages of Great Abington* (?!) in the South and the graphic needs to be clearer."

"We did: The policy has been refined to reflect the new and updated evidence base documents including on ecology, heritage, landscape transport and water. The Heritage Impact Assessment has also been updated to reflect the outcomes of the geophysical survey and recent listings process by Historic England for the Bronze Age Burrows to the west of the site, which is now a Scheduled monument."

Phew! Our concerns about the boundaries being too close to the village* and the lack of clarity has well and truly been addressed by making the Bronze Age Burrows a scheduled monument, thanks GCSP!

What we do know, according to a cabinet meeting held on the 21st July, is that the boundary has actually been moved between Little* Abington and the site – "slightly." So what does slightly mean? Guess what, dear reader. They don't know!

Not a single person available at the exhibition was able to give us a scale. Here comes the magic word again: "indicative". We were told that the change was indicative and that the diagrams were indicative. So that clears that up!

The written policy does not resolve this. It calls for "sufficient" or "appropriate" separation and a green buffer, but gives no minimum width and does not quantify how much the separation has increased.

This is Schrödinger's map: the separation has apparently increased, but nobody can tell residents by how much.

Is this a positively prepared plan?

* NB: The South boundary GCSP refers to is actually Little Abington, not Great Abington. Not only are our friends on the planning team unable to measure distances, but seemingly incapable of reading a map. See below, where the position of Little Abington is placed far lower than the village actually is.

Grange Farm occupies one of the highest points in the area, reaching approximately 76 metres above sea level. From the hill, on a clear day, you can see as far as Ely. That's before a single new building is added.

The revised plan replaces the former average density of 50–55 homes per hectare with 30–40 around the edges and 50–60 in the centre. It still contemplates taller and landmark buildings but sets no maximum height or number of storeys. When we asked? You guessed it: those details would be determined later through the masterplan and design codes.

We still cannot tell how many homes might be flats, how tall the town centre could be or what enforceable height limits would protect views and the character of nearby villages.

We're no developers, but surely you cannot mitigate a housing estate on a hill by scooping out the centre?

Picture the scene. It's 2035 and your foot is on the clutch, ready to pull out of Little Abington onto the A1307 for an appointment at Addenbrooke's. You have been waiting for 15 minutes as additional traffic crawls past from a town ten times the size of the Abingtons.

"Hang on a second," you think to yourself, "didn't GCSP's modelling predict that only 60% of trips from Grange Farm would be made by car? Where is all this traffic coming from?"

Well, as most of the employment growth is concentrated in the North of town, where Cowley Road was initially proposed, the roads have become inevitably jammed by people trying to get to work, escaping from just two access/ exit points on the southern side beside the A1307. It's chaos!

There used to be a vague arrow indicating a possible north-western entrance during the consultation phase in 2026, but that remained "indicative," and is still being explored with National Highways and must overcome sensitivities around the Roman Road…

But don't fret! This burden on one of the region's most dangerous roads is exactly what Cambridge South East Transport (CSET) was designed to mitigate. Or was it?

The exhibition material stated:

"Grange Farm is dependent on the Cambridge South East Transport (CSET) project and its extension into Grange Farm. This must be delivered in the early stages of the development as it is a key part of the transport package for the site."

But wasn't CSET planned long before the Greater Cambridge Local Plan? "Yes, that's true," Planning Policy Manager Jonathan Dixon told SAVE. Did that mean it was designed to address existing traffic pressures, rather than the traffic from these new developments? After a pause: "Yes, that's also correct."

Could an existing scheme mitigate thousands of additional homes without clear evidence that it can accommodate both existing demand and Local Plan traffic? Lunacy, you think.

You wish you had taken the Park and Ride at the new Babraham Travel Hub. The segregated CSET extension across the A11 into Grange Farm was a key reason planners considered the location suitable, but it still isn't there. The policy allows a temporary bus service instead.

We were told that buses had been modelled from Grange Farm to campuses across Cambridge, including destinations north of the city. As one bus whizzes past, you wonder why a supposedly "sustainable settlement" close to local employment relies on transporting residents through or around Cambridge to reach northern jobs?

• How long could temporary bus measures last?
• How many homes could be occupied before the permanent link is required?
• What would trigger its construction?
• Would that trigger be enforceable and backed by secured funding?
• Have safe and sufficient access arrangements actually been demonstrated?

We have not seen a complete, committed funding package for the CSET extension or the other transport works on which Grange Farm depends.

*This passage imagines a future scenario, so parts are necessarily speculative. But speculative ideas appear to underpin many of the plan's assumptions, so we're following GCSP's lead.

Technical work has been undertaken. The promoter has produced transport, water, landscape, heritage and ecological reports.

Our concern is that, despite that work, definitive answers to fundamental questions are still being deferred.