Ok I think what you need to do is ring round as many rescues as you can tell them your story and hope that one will take them on. Try these

Cat Rescue and Rehoming Shelters in Somerset, UK

Also post this on Purrs In Our Hearts - Cat Forum UK - Index
'Free to Good Home' forum helping needy pets (Invision Plus)
Rescue Helpers Unite

As these forums have alot of rescue people on and I would be surprised if there isn't one rescue on them that wouldn't help you
good luck

__________________