Thanks for the advice all.
I have been and met Jim and the dogs and their lines were impresssive. Top-notch from what I could establish.
They were clearly being used for their traditional roles too, which was also of confidence.
As has been pointed out Jim keeps himself to himself, and focuses on his dogs and work, which liked.
So to get a second opinion from others, and guys who have seen is dogs 'in action' is really reassuring.
Cheers