I can't answer, but mine is doing the same thing except generally it happens when I go above 60/70 mph and it doesn't matter what I do with clutch, breaks etc it's only putting my foot back on the accelerator that makes a difference.
Am beginning to worry a bit about it - thought it might be a belt or something slipping but noise is pretty loud. First garage couldn't find anything so more trips I think!
Luke Sugden
May 2008