I see a cross tup made £5800 ,figure that one out.
I would guess it was Beltex X Texel which could easily be used by someone as a stock tup for breeding their own tups for home use (with possibly a few suitable for minor sales).
But the rest of the crosses are bought purely as terminal sires. Most will have been bred from poorer ewes not suitable for pure breeding, but they will often look good due to hybrid vigour, and heavy feeding and expert dressing. And that's what attracts bids, even though they will usually throw lambs with a fair amount of variation (segregation)