Gilbert Clarke leans back on the seat of his mobility scooter, cranes his neck and gazes into the bright blue skies over East London, remembering the moment 80 years ago when he knew the invasion of France was under way.
Clarke, then an 18-year-old Royal Air Force volunteer from Jamaica, was still a trainee learning about the intricacies of radar systems when the roar of aircraft engines forced him to look to the heavens on June 6, 1944.
