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land & farming — research notes, part two
A companion to the main BNG & Environment Bank page — the tax rules driving some of the "land grab" concern, the lower-commitment government schemes worth comparing against a 30-year BNG contract, and a few genuinely different routes: carbon codes, nutrient credits, community ownership, and rewilding.
01 — Tax
This is the piece of policy sitting behind a lot of the "land grab" concern on the main page. From 6 April 2026, Agricultural Property Relief (APR) and Business Property Relief (BPR) — which together have historically let qualifying farmland and business assets pass on entirely free of Inheritance Tax — are being capped for the first time.
The 2024 Autumn Budget first proposed a £1 million cap. After sustained pressure from farming groups warning it could hit around 70,000 farms, the government raised it to £2.5 million in December 2025 — a significant softening, though the underlying principle (unlimited relief is over) is unchanged.
Any unused allowance can now pass to a spouse or civil partner, meaning a couple can shield £5 million of combined agricultural and business assets — a late addition that materially changes the planning maths for married farming couples.
Government modelling suggests roughly 85% of estates claiming APR in 2026–27 will still pay no additional Inheritance Tax under the revised £2.5m threshold — this is really a change aimed at the largest estates, not the average family farm.
02 — Alternative
Before locking land into a 30-year BNG contract, it's worth understanding the government's own environmental payment scheme — the Sustainable Farming Incentive (SFI) — because the commitment involved is a completely different shape.
| Feature | SFI26 (government scheme) | BNG via Environment Bank |
|---|---|---|
| Agreement length | 3 years | 30 years |
| Minimum land size | 3 hectares (about 7.5 acres) | ~25 acres (commercial threshold) |
| Payment cap | £100,000 per agreement year | No cap — scales with units generated |
| Who administers it | Defra / Rural Payments Agency directly | A private broker (Environment Bank etc.) |
| Reversibility | Much easier to exit or not renew | Legally locked in for 30 years |
Window 1 opened 30 June 2026 for small farms and those without an existing agreement; window 2 opens September 2026 for everyone else. It's budget-limited, so windows can close early once funds are allocated.
The action list was cut from 102 to 71, and standalone management payments were withdrawn — SFI26 is now more tightly tied to specific delivery actions than its predecessor.
At least £50 million is earmarked for new Higher Tier agreements in 2026/27, aimed at higher-value habitats like species-rich grassland — closer in spirit to BNG, but without the 30-year private contract.
03 — Mechanics
The main page talks about "biodiversity units" without explaining how a field actually becomes a number. The calculation — Biodiversity Metric 4.0, DEFRA and Natural England's statutory tool — comes down to a fairly simple multiplication, even though the underlying habitat classification is detailed.
Biodiversity Units = Area × Distinctiveness × Condition × Strategic Significance
— the core formula behind every BNG unit calculationHow rare or ecologically valuable the habitat type is, using the UK Habitat Classification system. Intensively grazed rye-grass pasture scores low; ancient woodland or species-rich wetland scores very high.
How close the habitat is to its ecological best state — a wildflower meadow choked with one dominant grass species scores lower than a genuinely diverse one, even at the same distinctiveness band.
A multiplier for location — habitat inside a Local Nature Recovery Strategy area, or connected to other high-value sites, is worth more per unit than an identical habitat sitting in isolation.
04 — Alternative
The carbon-market equivalent of BNG — government-endorsed, but voluntary rather than mandatory, and driven by businesses wanting to offset their own emissions rather than developers meeting a legal requirement.
The UK standard for woodland creation carbon projects. A new native woodland can generate roughly 400 carbon units per hectare, sold either upfront or as the trees actually sequester carbon over time. Over 38,000 hectares have been validated under the code to date.
The equivalent standard for restoring degraded peatland — highly relevant to upland Cumbria specifically, where drained or eroding peat is both a carbon source and a flood-management liability once restored.
Sometimes, but not freely — government guidance is explicit that you generally can't sell both biodiversity/nutrient credits and carbon credits from the same specific enhancement on the same land, to avoid double-counting. Different areas of the same holding, or different interventions, can potentially run separate schemes side by side.
05 — Alternative
A separate, similarly-shaped offset market to BNG — this one aimed at nitrogen and phosphate pollution rather than biodiversity. It isn't background theory here: Cumbria has a live scheme, and one of its four catchments sits right on the doorstep of the Cockermouth story on the main page.
Certain rivers and lakes are legally protected (Special Areas of Conservation, Ramsar wetland sites) because they're already sensitive to nutrient pollution — mainly phosphorus, which causes algal blooms that choke out other wildlife. Where a protected water body is already in poor condition on nutrients, any new housing development in that catchment has to prove it won't add a single extra kilogram of phosphorus before it can get planning permission. If it can't achieve that on-site, the developer has to buy a credit from someone who removes an equivalent amount elsewhere in the same catchment.
Cumbria Nutrient Neutrality is a live partnership between Westmorland and Furness Council, Cumberland Council, and the Lake District National Park Authority. It covers four specific catchments, and credits are locked to whichever one they're generated in — a credit from the Eden can't offset a development on the Derwent, even though both are in Cumbria, because phosphorus entering one river does nothing for water quality in the other.
North-west Cumbria — the catchment closest to Cockermouth, and the one most likely to be relevant to land in this area.
The largest of the four, stretching into Durham, Northumberland and North Yorkshire.
Split either side of Kendal, with a second block northeast of Windermere.
Between Windermere and Coniston — the most productive of the larger Lake District lakes.
Each credit represents 1kg of phosphorus per year, tradeable in increments as small as 0.01kg. There are two recognised routes to generating one:
A farmer with a field currently receiving slurry or fertiliser signs a long-term legal agreement to stop applying it, or to cut stocking density on that specific parcel. An assessor calculates what that field was contributing to the river under its current use, using a standard nutrient-export model, and the calculated reduction becomes the credit.
A lot of rural Cumbria still runs on ageing septic tanks and package treatment plants that leak phosphorus directly. Upgrading one to tertiary treatment that strips phosphorus out generates a credit against its pre-upgrade baseline.
Prices vary hugely by catchment, driven by scarcity — only so many phosphorus sources exist within any one catchment, so credit supply can be genuinely tight in a small one. Nitrogen credits have sold for roughly £1,800–£3,000 each in statutory schemes elsewhere in England, while phosphate credits — being scarcer — have ranged from the low tens of thousands up to £100,000 per kilogram in the most pressured catchments.
Nutrient credits only cover the marginal extra load from new development. The existing legacy pollution — decades of undersized rural sewage works and storm overflows — is a separate, parallel obligation on the water company, not something a developer's credit purchase touches at all. If that obligation weren't being enforced, nutrient neutrality would just be freezing a catchment at an already-poor baseline rather than it ever actually recovering.
The Water Industry National Environment Programme, run by the Environment Agency and funded through Ofwat's price review process, is what actually forces United Utilities to upgrade treatment works — a statutory obligation, independent of any credit market.
United Utilities has pledged £156 million specifically for Windermere, aiming to cut sewage spills from 388 a year to 80 by early 2028 — a 75% reduction — plus phosphorus-stripping upgrades already under way at Troutbeck, Near Sawrey, Ambleside, Grasmere, Hawkshead, Langdale, Outgate, Far Sawrey and Ferry House, all feeding the same catchments covered by the credit scheme.
A separate £10.6 million fast-track programme is upgrading 21 rural treatment works across Cumbria to cut storm overflow frequency, part of United Utilities' national commitment to reduce spills by at least 50% by 2030.
06 — Alternative
The genuine third option beyond "sell to a private broker" or "keep it entirely within the family" — a democratic, community-owned model for holding agricultural land, aimed directly at the land-grab problem raised on the main page.
A Community Land Trust or Agroecological Farmland Trust — usually structured as a community benefit society — raises capital through community shares to buy land, then leases it to farmers under terms that protect its long-term use rather than maximising short-term value.
Decisions about the land are made democratically by trust members rather than by whoever holds the most capital — the structural opposite of the "whoever can afford the cash purchase wins" dynamic described in the main page's land-grab section.
Except where land is gifted, most trusts must raise the full purchase price through community shares — a genuinely slower and harder route to secure land than a cash buyer with bridging finance, which is the model's biggest practical limitation.
UK examples include the Ecological Land Cooperative and various regional bodies such as Middle Marches CLT, which leases parcels to individual farmers or working groups while retaining trust ownership. The model is most established in housing, but is actively expanding into food production and nature restoration.
↑ back to top07 — Context
Worth knowing as a distinct philosophy from a BNG habitat bank — less managed, less contractually locked, and driven by a completely different logic, even though the two get lumped together in casual conversation.
Charlie Burrell inherited the 3,500-acre Knepp estate in West Sussex in 1983 and spent 18 years struggling to make conventional arable and dairy farming profitable on its heavy clay. In 2001 he removed livestock and internal fencing entirely, letting free-roaming cattle, ponies, pigs, and deer shape the land instead.
Roughly 75 tonnes of pasture-fed wild meat sold annually, plus safaris, glamping, camping, and an on-site butchery projected to turn over £500,000–£700,000 within five years — a genuinely diversified income model rather than a single 30-year lease payment.
No developer money, no 30-year legal contract, no registered biodiversity units for sale — it's self-directed land management for its own sake (and profit), not a mechanism for someone else to discharge a planning obligation.
08 — Sources
Worth checking directly rather than relying on a notes summary — several of these figures (SFI windows, IHT thresholds, nutrient credit prices) move quickly.
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