I am thinking of buying some new kennel runs, can anyone recommend some reasonably priced ones.

Try www.caninekennels.com, they're up north and do a range of modular runs.

Canine Kennels are very good. Friendly folk ready to give advice. We bought our puppy pen and run from them, and even though my neighbour signed the receipt, they did not argue when we found two panels missing and one damaged, but replaced them immediately. I would certainly use them again.:)
Jean