Hi Gareth,
I am guessing that there may be a microswitch problem with the roof box.
The whirring sounds to me like the hydraulic pump is working, (thanks for the suggestion though Steve), therefore trying to continue with the operation. If that is the case could the roof box switch be the problem and where is it so I can check? I have cleaned the 90 degree swivel switch on the LHS,are there others I should know about.
Sir Pookie
BTW Thanks Ashley but it is none of the problems on the link you sent, they don't tell you how to fix them anyway.