As I mentioned on Eachandeveryone's thread all cat rescues are desperate for kitten fosterers at the moment. You would need either a spare room, or a kitten pen could be put in any room really as long as there are no escape routes in it. You would then need to spend time playing with and socialising the kittens for a few weeks.
If anyone is in East or North London or Essex and is interested please pm me. Or if you're anywhere else then contact your local rescue.
I caught these three yesterday. They need someone to spend time with them and we have completely run out of fosterers. And there are probably many hundreds more that need to come in.