Kaye's Cattery (where you got Hannah from!) has plenty of room I think... its owned by different people than when Hannah was there but I'm not sure what the new people are like. It doesn't seem very busy when I ride past but there are a few horses turned out and I think the school is floodlit.
Can't think of anywhere else off hand... but if I do I'll post them here.
If you are near gillivers vet then there are many around there! Do not know any names maybe best to look in yellow pages and take and experienced friend with you!