That’s a pretty tough one. I take it you’ve tried an enquiry to B&Q? :rolls: .
I’ve often managed to fix broken doors/hinges/handles by drilling holes through plastic and using cable ties/wire/epoxy putty or whatever seems appropriate just to hold things together temporarily while a part is on order. Seen a few machines round here where customers installed their own lock in the form of a sliding bolt riveted or screwed to the cabinet. Ugly but effective if done well.
Mike.