We ran two Charollais tups twice each through our outdoor lambing flock up here in the Cumbrian uplands, retaining the best ewe lambs for breeders. We took the advice to get a tup with plenty of wool on the top of his head, and the majority of the Charollais X lambs were fine. They do have a fine skin, and in bad weather we would jacket newborn lambs, but because they are fine-skinned, they are born quickly and easily, so are up and round to the milk bar very quickly, which gives them internal central heating. Whereas the Texel X lambs can be bigger, rougher skinned, resulting in harder, longer lambing, lambs worn out when born and taking longer to get up and get to the milk bar. So on balance, the Charollais X lambs do as well or better. And once they're through the first few days, the Charollais X lambs grow faster and better, and have better conformation.
Now many of our ewes have some Charollais in them, we won't use a Charollais tup again for a while. But we would certainly consider one again in a generation or two, when the Charollais blood in the ewes is a bit more diluted.
And believe me, if these lambs can withstand Cumbrian weather, they can cope in Cornwall.
All of which said, unless you're wanting top grade, fast growing lambs, well then why not Lleyn, when you have all that good grass. I just wanted to set the record straight about Charollais.