I noticed that too - quite a long time ago. I could never use them anyway as got blocked for some reason! I tried emailing them. I still don't know why - I'd even donated stuff before!
The Hamster Haven in Cheshire seems to have closed down too.
However - I have adopted my last two from Happy Hamsters who are doing a fantastic job. They do it all over the country and have people running different rescues in different parts of the country. There is one in York that covers the northern region. If you message them they have more hamsters than show on the Facebook page.
They have strict policies though, of needing a certain cage size before they will let you adopt - 100cm for a Syrian and 80cm for a dwarf.
Happy Hamsters UK - Home