Welcome to the forum, from Lanarkshire in Scotland.
I do have one question, and I'm sorry if you have been asked this lots of time before, but I am planning to get some chickens soon, and can't decide whether to get battery hen from the British Hen Welfare Trust or but POL ones from a breeder. I'm just concerned that battery hens will not be around for very long and there could be quite large vet bills to consider?
Also, if I do buy hens would a mix of Orpintons and Araucana's be a good mix? We have a 5ft fence and hopefully this is sufficient for these breeds - I think the Orpington's are fine with that height fence, but not too sure on the Araucana's?
The answer to your question depends on what your purpose is.
If you want to produce eggs in large numbers from happy hens, go for freerange POL ones, and replace them as they go off lay. If you want to rescue old battery hens, you regard them as pets (to an extent) and accept some overheads & reduced eggs, although they can lay for several years once they are over the trauma of being ex bats.
Choose whatever hens you like - they're yours after all!
A 5ft fence will restrain the heavier breeds, but bantams would go straight over the top. I prefer 8ft fencing which keeps most in, but sometimes have to clip the wings (one side only) of new birds to stop them going over. Once they get used to the boundary they don't bother even when the feathers grow back again (usually). You only trim one side of the flight feathers - this unbalances them & they can't fly straight.
It also depends on what is over the fence - if it's merely a nuisance to get them back from the garden, then you don't worry as much as if they are getting into somebody else's property.
Whatever you decide, enjoy them!
John