Thank you both for your replies. Even though I've had sheep for almost 10 years, I started with shearling ewes that were especially easy in some ways so I still feel I'm a novice.
I definitely check my sheep everyday...or rather, they check me. As soon as I come down to feed the horses they start running to me for a treat. I only have to look for them during the nicest of summer weather when they are so full of grass they can't be bothered, or when it is raining and they don't want to leave their shelter.
Mine were/are 3/4 dorper 1/4 wiltshire horn and I can't get that cross easily again, I don't imagine. I know a lot of people don't want dorpers because of their feet (they grow a lot of hoof) they are easy sheep. They are also non-selective grazers so your get a very nice pasture from them! I was lucky because I had one shearling that had been bottle fed for a little while so she was very tame. The others learned from her.
I still have that very tame sheep and another ewe so it makes sense to get some new sheep now so her tameness might rub off on them. I like the Ryelands for their temperament and cuteness (and lack of escapism) and there is a breeder near me who seems very reputable and shows a lot.
I read something on another forum about the ryelands always being on the backs and that is why I thought of that. I am a little nervous about such a woolly sheep but you can't have everything. Even with my crosses, I used to get very fed up with trimming hooves constantly!
Again, thank you so much for your replies. I will ask another question about ryelands separately.