Spiros,
A non-migratory licence will do for brown trout, rainbows and grayling. Rivers and lakes.
Grayling are a bit unusual in that some game anglers don't want to know them. I can't see why as they are a great quarry. They are technically speaking, a game fish as they have an adipose fin, but who gives a toss, as long as they have fins and take a bait?