Hi Alfa, first question WHY do you want goats? for milk, for meat, for cuteness? Goats are not just put into a field and get on with life (or death as in the case of sheep), they need fencing, a shed - preferably with electricity and water, daily 2x min feeding, 4 - 6 weekly foot trimming, etc etc.
Dairy breeds are different from meat breeds, and there is also pygmies, but these are just for pets.
If you want milk you need to think how much you need/want/can make cheese from, and that should influence your choice of breed.
And even if you are successful in getting a walking licence you would need the agreement of the landowner whose land you would be walking on, and I am not sure they would share your enthusiasm for goats and their hedge eating habits.... Easier to collect browsings for them after agreeing with landowner to take certain parts of the hedge (i.e. above the annual cutting line), willowherb and similar side-of-the-road-weeds.
I think you will need to do a bit more homework before getting goats - I am not being patronising, but have seen so many goats needing re-homing after their enthusiastic owners ran out of steam...