How about a Typhoon? Even though it is late coming into service I don't think it is a museum piece like the other aircraft you mention! Could have been one from CGY - apparently they have heaps of thrust so they don't need to roar around at high power settings. Skegness is a recovery point for CGY aircraft, though most of the Typhoons are based at Warton I believe, one might have 'escaped' to visit its future home.
SG