[Tim W]

How do you get a good carcase on something so small?  You'd surely have to cross with progressively larger breeds and put a second or third generation cross onto a decent terminal sire to give a carcase that would be of interest at the mart.

you may be surprised at the size/growth rates of cross bred animals with extreme hybrid vigour?

I used Barbados Black Belly (40kg adult weight ---mostly P grades) on lleyn & Wiltshires to get very high performing 1st crosses. The genetic base of the BBB being so different from our native breeds that the effect of hybrid vigour is extreme