I hope this is the right place to put this feel free to move if it is not.
I was just searching through the the preloved website and spotted a 2nd hand barney cage in West Sussex
large hamster/mouse cage For Sale in Henfield, West Sussex | Preloved
this one is in lecister
Barney Hamster Cage & Accessories For Sale in Loughborough, Lecister | Preloved
I hope this helps anyone looking for something like this. they don't look to be in too bad a shape but I notice the one in lecister has had the shelves painted blue.