Hi there - thanks for that, although my remote seems to have one battery (definitely nothing underneath it!) and both remotes went wrong at exactly the same time, which suggests it's the receiver. Also the car is now working OK on both fobs, whereas yesterday it wouldn't work with either, so it seems like it's definitely a receiver fault. I doubt the garage can repair an intermittent fault - I'll take it in anyway, even though it's now working, in case it's a known problem.