Hi,
I've been on the NCT house swap register: groupsyahoo.com/group/NCT Houseswap Register/#ans which looks interesting, I'll phone them for more details.
Where are you based in Yorkshire? We're in Bishopbriggs, East Dunbartonshire. Its a quiet wee village close to Glasgow but a stones throw from the Campsies and some stunning locations. We were kind of hoping to escape for a few days around the mid term October week sometime between the 11 and 20 Oct. If you're interested let us know