Thanks Leon. I've got plenty of problems, this is just one of them!
I'm prepared to peel back the rubber casing and collimate them myself (if it's possible with this model). I just need a push from someone who's done it before.
I rather not turn my cheap binoculars into "expensive" cheap binoculars by forking out for the replacement postage to and from Andrews.
I've broken far more expensive things with a screwdriver before...