"I think you might have missed the point I was alluring to; namely that Virgin were citing "engine problems" when there might have been another, more mundane reason, for flipping a 767 around and flying 3 hours back to LGW and dumping 280 passengers into hotels for the night (when it was probably only another 4 hours to the destination)."
More conjecture too.....VS have never flown 767s!