Welcome,
ref the Greenalning, 2 things to do.
1) Join GLASS, then you will have access to trailwise2, a good mapping resource for the byways , UCRs etc .
2) Look on FB, there are lots of greenlaning groups, find the local GLASS one to you and get in touch with them.
Just be aware the lanes are generally very overgrown at the moment and if you like your paint then be very careful where you go.
Cheers