I own a low-mileage 2011 Mercedes-Benz E500 convertible that has a full service history. It has a front wind-deflector at the top of the windscreen - activated via a push-button in the centre console - for use when the roof is lowered. As you might imagine, I use this a lot over the summer, but not so much over the winter.

When I tried it earlier this month it did not work so I took it to my dealer who told me the mechanism had failed and a new one would cost close on £1000 including VAT and fitting. They tried to get Mercedes to agree an out-of-warranty repair but were turned down so then they tried for a goodwill contribution. Mercedes has offered 40 per cent.

This same part failed in March 2014 but was fixed then by the dealer. I asked the dealer to do an end of warranty check in December 2014 but they admitted this part would not have been tested so it is possible the part failed whilst in warranty but was not discovered until after expiry of the warranty. Do you think the goodwill offer is enough?