Thank you so much!

I've tried putting a bit of cardboard between the black switch and the white thingy but it didn't make any difference - the beep and flashing light continued. grrr!

Will drop into the garage tomorrow with your comments to see what they think.

Thanks for your help (and sorry for the delay). Can you tell me exactly where these micro-switches are located - so I can tell the garage! Thanks!

Yes! It's driving us nuts!

So, when I start the engine the warning light and beep commence. Then I raise the roof a couple of centimetres and then lower it again and the beep stops but the light continues flashing.

From what I have read it would seem the problem is something to do with the sensor ...