I don't know how you feel about moving north of the border, but there are quite a lot of consultancy-type jobs going around Glasgow and Edinburgh. As I understand it, there's quite a lot of expansion in this area, and you might be in with a shot?
I do think that experience is your best bet, and getting to know the right people. Is there a uni \ college \ community centre near you that runs public lectures or seminars on local wildlife or environmental issues? Getting your name know to the speakers might help out; they at least might be able to offer you some advice on local opportunities and volunteer projects?
Stick at it - if you really want this it'll come together in the end, but it'll be hard work
zan