In reply to Sharp:
You might try Alpkit, they have a funding pot that you can bid for, here you go and other businesses eg Patagonia, Aviva.
The Alpkit Foundation make small awards to people, groups and schools that work to remove the barriers in getting outdoors and experience wild places.
They want to support:
Diversity and Inclusion Projects that engage individual and groups from a diverse range of backgrounds
Environmental Projects that seek to support, conserve, or generate understanding of our environment and wild places
Health Projects enabling people to gain physical and mental wellbeing from the Great Outdoors
Education Projects such as First Aid, D of E, Forest Schools and Mountain Leader
Participation Projects that get more people experiencing the Great Outdoors
Hope that helps, it's all about putting together a good bid. If you need any more info feel free to message