On reflection the answer to the original post should of been yes and yes.
Ill help you but i will not be giving you a list of lanes to drive.
Get yourself a 1:25000 os map of the area you want and google what you can and cant drive and then find them on the map. Then when you have the grid references of the lanes you THINK you can drive. Call the councils definitive map department(usually highways dept) and ask them if there are any restrictions for those roads/lanes and if so how long they last for.
That is what we have to do everytime we want to drive lanes and thats why people dont share much info with others. Because it takes time and effort and alot of people cant be arsed.
That said, its great fun and great to get out in the countryside. So i hope you do bother and enjoy and drive responsibly.