I don't know enough yet to suggest value, but perhaps a suggestion for dev?
Maybe you could put up a mini-site about wild mushrooms and how to recognise the edible ones? I see you're in the UK too. You've probably seen a few TV programmes recently about foraging for wild food, with dire warnings to make sure you know which ones to pick when it comes to mushrooms?
Perhaps with affiliate links to Amazon books on the subject?
HTH
Cheers, Jon