Vera Lynn sang about birds

flying over the cliffs of Dover.

What colour were they?

CORRECT

Image in the pubic domain.

Blue birds over white cliffs

To her audience, she was the 'girl next door' type, reminding those away at war of their loved ones back home. Her last public performance was in 1995 at Buckingham Palace, commemorating the 50th anniversary of VE Day. Her signature songs were "We'll Meet Again" and "White Cliffs of Dover".