Meh, I doubt you'd get a refund tbh, as it's an issue with your own car not meeting the regulations, as much as it was through a gust of wind. Bad luck neither of you had a spare. Personally i'd have asked in the sudden circumstances if it was acceptable to drive directly to a garage and buy a new one. The worst they can say is no.
There isn't much else the examiner can really do tbh? You're not allowed to drive the car, they can't drive the car for you and they're on the clock with another test to get back to, they can't just kick about on the hope you get someone to quickly come and move the car and take them back to the test centre