So on Saturday afternoon, we picked them up from the house (where they've had free-reign for quite a while now, and shoe-horned them into the pet carriers... they don't like them at all - probably because whenever they go into them, they're either on route to the vets or the cattery.
The cats ( we've 2 of them) were soon let out of their cages and allowed to explore their new home. Sox (the black one with white feet) has no fear of anything... she happily came out to explore but George... well lets just say he's frightened of his own shadow.
I lost them after a few mins and found them both hiding under the sink... ie the only bit I've not yet boxed off properly.
Now I'm not a cat psychologist but I figured it best to leave them there until they settled down a bit - poor old George was panting a bit and I could tell he was distressed.... SO I put food, water and a litter tray down in the bathroom for them and settled down to watch TV.
In a few hours they came out and things seemed more normal.