Hi Julie. I don't know where you are but previous posters are right, the Leicester is not very hardy - fine-woolled and thin skinned.
An Exmoor breeder of BFLs is the farmer I often quote as saying, "Sheep's only got two hobbies. What they can eat and what they can die of." Exmoor is a wet, cold place...
Hopewell's dad is right - the show type, with the very blue face, is likely to be less hardy than the crossing type. However, some of the crossing types will also be quite soft, as the fine wool is a desirable trait to be passed to the mule ewe daughter and fat lamb grandchildren. Some mule breeders require a hardier Leicester however as their conditions demand it, hence some of the crossing Leicesters will be a bit less soft.
If you have mild, not too wet winters where you are, and would have some shelter for them in the worst of any wet cold weather (and, if you were breeding pure, somewhere indoors for lambing ewes and newborn lambs should the weather be wet and cold at lambing time) then the Leicester would probably cope.
They are delightful sheep, very friendly and usually not at all aggressive (although I have been knocked over by a tup who knew I had a bucket of food on me which I was refusing to put down for him!) The BFL ewe is a fantastic mother with a lot of milk for her lambs. Not a bad carcase when purebred, and they'll produce good fat lambs crossed to a Texel. BUT, as well as the lack of hardiness, the other problem for a novice is that the mothers are prolific and will frequently have triplets, sometimes quads - which will mean more work at lambing time and knowing when and how to take lambs off the mother and hand-rear, or whether and when to leave three with mum and top up from a bottle.
So, if you are where the winters are wet and cold, or if you don't have shelter for them in any cold and wet weather you do have, or if you couldn't lamb them safely indoors should the weather at lambing time be wet, then this breed is definitely not for you.
Because of the multiple births, it's not the easiest breed for a novice, even if you have the climate and shelter for them.
However, their delightful nature does mitigate some of the downsides of them for the novice.
Hope that helps
Sally x