Thanks for all the info guys and girls.
I think I'll be going for Jacobs to begin with - mainly because I know the past person who lived here had them and they lived to a ripe old age - and probably without much looking after, as she was always away on holiday. Ours however will have as much looking after as they need!
I'm not planning to be breeding any just yet - I'd just like to get the essential husbandry established before adding the complications of lambing, as I'm new to sheep. I can probably help out with some of my neighbours during lambing next year to get some experience there.
Just ONE more thing - do you all use dogs for your flocks - I know I'm only getting a couple, but was just curious really. I have a quad and a pony and a family who will be happy to help with rounding up (pony is used to larger quarry though - I used to use him on New Forest Pony drifts and cattle round ups in the New Forest, but I'm sure he'll be happy to lend his skills to sheep herding!).
I also have a collie who is able to round the geese up and put them away into their house of an evening - maybe she'll manage sheep, we'll see!