This is such a good idea (especially as some of the cages are enormous).
I am in Sheffield and happy to hamsit if anyone needs one, I would prefer the hamster came and stayed with me so I could watch over it easily and properly and they came with their regular food and any likes - dislikes treats wise
Oh and of course I would be sitting for free, it would be a treat for me to have them you shouldn't have to pay
PM me.