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RHS calls for compensation as A3/M25 Roadworks leads to 350,000 fewer people visiting RHS Garden Wisley with devastating financial consequences for gardening charity

With 350,000 fewer people visiting RHS Garden Wisley annually due to the National Highways A3/M25 roadworks, resulting in £6 million losses to date, the RHS is calling on Government intervention for compensation to enable vital science, community and education projects, now at risk, to proceed. 

As the A3* closes for works again this weekend, the RHS is sharing that its losses will rise to £11 million when the roadworks end in 2026; substantial for a gardening charity, but small change compared to the £317 million scheme.  

Due to the financial losses the RHS is now delaying the development of new arboretums at its gardens and the planting of 4000 trees to investigate climate resilience for the next century; significantly reducing funding for scientific research to find nature-based solutions to some of the UK’s biggest environmental challenges; cutting back on its community outreach work and looking at training 10% fewer work based student horticulturists over the next 2 years**.     

Nearly 80% of members who visited Wisley less frequently in the last 12 months, attributed this to the M25/A3 roadworks near the garden. Additionally, 63% of non-visiting members in this period attributed not visiting Wisley, for the same reason.*** 

One of the UK’s best loved gardeners Alan Titchmarsh and the RHS are now calling on everyone who values horticulture and gardens for a greener, healthier future to sign the RHS’ petition (rhs.org.uk/a3petition) urging Government to recognise RHS Wisley as a special case for compensation for the devastating losses caused by the National Highways roadworks to safeguard the RHS and its vital charitable work for the future.  

Alan Titchmarsh CBE, RHS VP and VMH, says: “With the £6 million losses the RHS could have created 15 NHS wellbeing gardens and brought gardening and nature to hundreds more schools across the UK.  £6 million would also fund 110 horticultural apprenticeships or 38 science PhD students supported by 76 UK leading scientists to find nature-based solutions to help issues like pollution, flooding and the biodiversity and the climate crises.     

“These losses are catastrophic not only for the RHS, but for the whole of the UK in terms of the incredible work the RHS does to help people and planet and educating and supporting millions of gardeners to garden more sustainably for a better future.  

“Unlike others that failed before it, this Government must recognise the importance of horticulture, of gardeners and of the immense positive benefits gardens, gardening and growing plants can have on our health, the environment, wildlife and biodiversity to safeguard the future for generations to come.    

“Every gardener, everyone who loves gardening and everyone who loves RHS Garden Wisley, one of our finest gardens, please sign our petition and stand up for our nation of gardeners.”  

Given to the RHS in 1903, RHS Garden Wisley is a unique place of historical and horticultural value.  With one of the world’s largest plant collections, with over 25,000 different species, it is the oldest and most horticultural diverse RHS Garden, where today hundreds of students are trained and over a million visitors normally enjoy the garden each year.   

RHS Director General, Clare Matterson CBE said: “The Highways compensation laws are complicated and unlikely to enable the RHS to recoup these devastating losses.  If there was ever a special case for compensation surely RHS Wisley stands out as a national treasure that needs to be upheld and prized and our charitable work as vital to be protected.    

“Whilst we’re grateful for the new road and the positive difference it is now beginning to make following months of disruption, going back to our original objections it continues to be a flawed solution that increases car miles around J10 by some 1 million kilometres per annum, affecting the Special Protection Area****.  We continue to believe circular routing could have been avoided, saving these increased car miles, by creating slip roads off the A3.   

“At the time of granting consent to the scheme, the Secretary of State reviewing the Planning Inspectors decision assessed that the RHS had a case, but that we were overstating the heritage and economic harm and that it would be short lived and insubstantial.   Today we can now evidence that the harm is exactly as we predicted.”  

The A3 closure over the coming weekend will begin overnight on 17 January through to the morning of 20th January - leading to the RHS once again facing dramatically reduced visitors to the Garden.   

The A3/M25 works began in September 2022, since then there have been dozens of road closures and significant disruption and traffic issues for visitors getting to RHS Garden Wisley.    

The £6 million losses to date, includes nearly £1million impact on RHS membership income.  Since September 2022 to date there has been an overall 25% reduction in visitors at RHS Wisley, severely impacting gate admissions and secondary income.  

Clare finishes: “The RHS has been here supporting gardeners for over 220 years, today we now need your help to safeguard this charity for hundreds of years to come.”  

-ENDS-

Notes to editors

For further information please contact Hayley Monckton in the press office or email pressoffice@rhs.org.uk 

*On Friday 17 January 22:00 until Monday 20 January 06:00, the A3 will close in both directions, between Junction 10 of the M25 and the B2215 / A247 junctions with the A3.  

**As a result of the A3/M25 Works the RHS is having to consider taking on 10% fewer work based student horticulturists over the next 2 years and reducing the breadth of its training offer for some 3000 learners per year 

***Online survey research conducted in October 2024 on behalf of the RHS by Trueology - an independent insight & analytics agency. Wave 6, prompted awareness survey. n=514 

****The Thames Basin Heaths Special Protection Area (SPA) is a network of heathland sites that covers 8,274 hectares of Berkshire, Hampshire and Surrey. Within the borough of Guildford, the SPA includes Ockham and Wisley Commons. The SPA provides a habitat for three internationally important bird species; woodlark, nightjar and Dartford warbler. The SPA is protected from adverse effects under European and UK law. 

National Highway’s own modelling of the south facing slips alone shows that when compared to the DCO Scheme these components of the RHS Alternative Scheme would result in a reduction in travel on the local road network of 1,049,000 vehicle kilometres each year and some 1,740,000 vehicle kilometres if the strategic road network savings are included.

rhs.org.uk/a3petition - will go live overnight on 16 January 

For additional information - 2024 Summer holidays (July and August) RHS Garden visitor numbers were 30k down vs 2022 – 13% down verses a normal year. 

During four M25 junction or slip road closures, RHS Garden Wisley received 43% less visitors compared to both the previous weekends, and the same weekend the prior year. 

The RHS’ Autumn Festival of Flavours event was cancelled in 2023 due to roadworks, resulting in a £50K loss. Festival of Flavours visitor numbers in 2024 when the event returned were 10K less than 2022, a 34% reduction.   The trend continues with Wisley Flower Show achieving 31% less visitors in 2024 vs 2022 and the Winter illumination event Glow, was down by 50% in visitors in 2024 vs 2022, resulting in £360k loss in income. 

The A3 work was due to be completed in summer 2025 but is now set to run to the end of the year, with final completion in 2026. The delays will prolong the effect on RHS Wisley, taking several years for RHS membership to recover.  

About the RHS

Since our formation in 1804, the RHS has grown into the UK’s leading gardening charity, touching the lives of millions of people. Perhaps the secret to our longevity is that we’ve never stood still. In the last decade alone we’ve taken on the largest hands-on project the RHS has ever tackled by opening the new RHS Garden Bridgewater in Salford, Greater Manchester, and invested in the science that underpins all our work by building RHS Hilltop – The Home of Gardening Science.

We have committed to being net positive for nature and people by 2030. We are also committed to being truly inclusive and to reflect all the communities of the UK.

Across our five RHS gardens we welcome more than three million visitors each year to enjoy over 34,000 different cultivated plants. Events such as the world famous RHS Chelsea Flower Show, other national shows, our schools and community work, and partnerships such as Britain in Bloom, all spread the shared joy of gardening to wide-reaching audiences.

Throughout it all we’ve held true to our charitable core – to encourage and improve the science, art and practice of horticulture –to share the love of gardening and the positive benefits it brings.

For more information visit www.rhs.org.uk.

RHS Registered Charity No. 222879/SC038262

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The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.