There's a rescue near Croydon (Gerbil and Rodent Rescue) that has two Robos (separate) right now. I don't think they are tame though. They also have hybrids, and a female Syrian.
Animals looking for new homes
There's also GBH Rescue which usually has lots of hamsters though I don't know about Robos. They're in Beckenham. They don't seem to have a website anymore but this is a Facebook page for them:
Log into Facebook If you're not on Facebook you won't be able to see the page but the email address it lists is
[email protected].