The Telegraph article makes no sense whatoever. So the aircraft was spotted over Woodley on a particular heading. The assumption is then made that the same heading was maintained all the way to the coast and over the Channel. Some assumption.
It goes on to say that there would not have been a bomb jettison zone in that part of the Channel by December 1944. The reasoning does not make sense. Most supplies still went via Normandy well west of the area in question.
The Telegraph article also states:-
Last year one book, written by a former US colonel, concluded that Miller had been dispatched to Berlin by Eisenhower for a secret meeting with Rommel and other Nazi figures as part of a plot to topple Hitler.
Hmm! Rommel commited suicide on 14th October 1944, Glen Miller disappeared on 15th December 1944!
One of the worst pieces of jouranlism for a long time (Well, maybe that is going a bit too far - but still pretty poor!)