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Phew, I'm back to report on what happened. The car went in yesterday, I made it clear that if any other fault other than the acknowledged problem showed up then we'd simply pay for the 'level 3 diagnostic' (bit of a Star Trek joke there) and take it away until we decided what to do next. As it happens, the expected fault did show up and everything was done free 'as a gesture of goodwill' by VW. They gave me a form to sign for the work, the repair was listed as 'Replace ABS control unit'. I hope this can help someone else out. By the way, I did initially write to VW using the email address listed for customer services, but the email bounced back as undeliverable 5 days later. Meanwhile I'd called customer services at VW mentioning the chat on the web and the BBC report for good measure. They couldn't have been nicer. The young woman I spoke to was charming. So a good result all round, well done VW. And an outcome that allowed me to have a good night's sleep last night without worrying about how we were going to afford an expensive repair. I hope anyone else reading this will take heart and pursue the contact VW option before stumping up for a repair.