Thanks, wooly shepherd.
In my heart I knew I had to quit the coarse mix.I will stop it immediately - they like a wee bit wholemeal bread so they can have a nibble of that.
What area is it reasonable to give them, space wise for exercise? Do I leave them on it until it's grazed very short then move them on to a clean bit? Given the rain, the grass is growing really fast - they make no impression on the area they are on at all - so how small do I have to go?
I've finally managed to get my horse and dogs to good weights - so just the sheep left.