Hmm yeah it's a toughy as we're so close to Bradford, which is even worse than Leeds and there's no CP there (although there is a small RSPCA branch). We do re-home there if the circumstances are right. In terms of calls for help, we have to turn many away as we have so many problems in our own area. Having said that, our closest branch, Wharfe Valley has close connections to a lady who has a small rescue center in Bradford and often takes in cats and kittens in need for that area.
Unfortunately, if you work in a bad area, you have to turn people away and the problems will always far outweigh what we can do (sad, but true).
I would say that you could offer to advertise the cats on the website and re-home them from their current situation, but as we all know, there arent that many calls for older cats! I would take advice from Branch Support and see if they can put a shout out to branches in the area for help.