Even before judgment is handed down on the planned development of Wimbledon Park by the Wimbledon tennis tournament, the campaign against it may have already changed the legal landscape.
In a decisive ruling this week, High Court judge Mr Justice Saini rejected a last-minute attempt by the Mayor of London’s legal team to lift the £10,000 “Aarhus” cap on legal costs imposed on the community group Save Wimbledon Park (SWP). The decision was not just a victory for campaigners — it could now serve as a precedent for grassroots litigants fighting better-resourced opponents across the country.
At issue was whether SWP’s successful public fundraising effort — which raised over £210,000 from more than 1,200 donors — constituted a “significant change in circumstances” that justified retrospectively raising its cost liability. The GLA argued that the surge in donations removed the financial imbalance that justified the cap. But Mr Justice Saini disagreed.
“It does not seem to me appropriate for me to modify the cap,” he ruled, adding pointedly that such an application “falls at the very first hurdle.” The judge warned that it would be wrong in principle for claimants to face the risk of cost caps being lifted “if [they were] successful in fundraising.”
In effect, the ruling protects the principle that public support — not personal wealth — can fund access to environmental justice, and that such support should not be punished by cost inflation tactics.
What is the Aarhus Convention?
The Aarhus Convention is a United Nations treaty signed in 1998, which guarantees the public three essential rights in environmental matters: access to information, public participation in decision-making, and access to justice.
The UK ratified the Convention in 2005, leading to reforms that aimed to prevent prohibitively expensive legal costs from deterring individuals or community groups from challenging environmental decisions. The cost caps introduced under Aarhus rules are designed to level the playing field in environmental litigation — particularly where communities are facing off against public authorities or powerful developers.
An early blow to the Mayor’s legal team
The legal challenge brought by SWP centres on the Greater London Authority’s approval of the All England Lawn Tennis Club’s (AELTC) £200 million expansion into the former Wimbledon Park Golf Club. The judicial review was heard over two days this week and a decision is expected by the end of July.
But the cost cap dispute erupted at the very end of the hearing. Without notice, the Mayor’s team had applied to have the February 2025 order modified — a move campaigners described as an attempt to “move the goalposts.” The judge dismissed the application and ordered the Mayor to pay SWP’s legal costs for resisting it.
Christopher Coombe, a director of SWP, called the move “a real blow” to the group’s volunteers and donors. “That increase [in funds] came solely from relentless grassroots fundraising, not because we suddenly became wealthy,” he said. “We’re relieved and proud that this tactic has failed.”
A boost for crowdfunding — and for campaigners across the UK
While the ruling is not legally binding on other courts, it will likely be cited in future arguments — particularly where cost caps under the Aarhus Convention are challenged by public authorities or developers.
Environmental law experts have long warned of a chilling effect if community groups fear that raising money could backfire legally. Wednesday’s ruling offers reassurance: so long as funds are transparently raised and used to level the legal playing field, the courts will defend the public interest.
Though rare, similar cases have surfaced in recent years:
- In Venn v SSCLG (2014) – about the building on a new house in the garden of a Victorian house in south-east London – the European Court of Justice held that UK courts must ensure environmental cases are not “prohibitively expensive,” influencing the UK’s approach to cost caps.
- In Garner v Elmbridge BC (2010), campaigners against development on green belt land successfully challenged a planning decision, though not directly on crowdfunding grounds.
- In ClientEarth v BEIS (2018), where the government was repeatedly sued and beaten over air pollution, the use of public donations helped fund litigation to compel government climate action — a sign of how crowdfunding has become central to modern public interest law.
But Wednesday’s ruling may be the first to clearly state that fundraising success is not a reason to remove protective cost caps. Legal observers say the ruling gives future community claimants a stronger foothold in resisting retrospective cost increases.
One victory down, another to come?
While the court’s decision on the cost cap is already being viewed as a quiet landmark, the main judgment is still pending.
SWP’s case challenges the GLA’s approval of the AELTC development on three grounds: failure to properly consider restrictive covenants and a statutory recreation trust; mischaracterisation of environmental harm; and the false framing of a largely private sports complex as a public benefit.
If successful on any of these points, the planning permission could be quashed — and the matter sent back to the GLA for reconsideration. That, campaigners hope, would force the AELTC to rethink its approach and engage with residents on a less environmentally damaging scheme.
For now, SWP has already succeeded in reinforcing one principle: that communities should not be penalised for doing what councils and developers too often take for granted — raising money to defend their interests in court.
The next ruling — one that could reshape how green spaces across London are protected — is expected before the end of the month.
