You should be able to buy the rear foot pegs here- http://totallyttrs.com/ . I'm unsure if Brian has these in stock though. For some reason it seems the site is down, hopefully Brian will fix it soon if that's the case.
Welcome to the forum Mark! I am not too far away from you - just outside Exeter
Sadly Somerset lost a lot of their fabulous RUPPs over Exmoor following the NERC Act but still enough left to maintain interest. As Cubber says, we have loads of unsurfaced legal roads in Devon
Thanks to all for the advice and welcome. I agree not a lot of legal greenlanes on my door step, but loads of option within striking distance. I'll head down to Devon soon.
My shopping list is growing and I'll be in touch with Brian soon.
Merry Christmas, All.
Mark