As a relative youngster, it would be tempting to poo poo the Vera Lynn thing as ancient nostalgia. However . . . . . some thoughts
I was born after the end of WII. I am probably one of the first British generations to never have had to face death in the battlefield, in the air, or on the sea. I did not have to do National Service, And I can say that I have never been in a position that I have had to consider that I may be killed (except broken down on the hard shoulder of the M4). Although there have been military conflicts in my time Falklands, Bosnia, Afghanistan, Iraq and others, none of them have even come close to me requiring me to risk my life. I dislike the soft expressions "lost their life" "passed away" etc, the words are killed and died.
In WII our servicemen had to go and serve, and fight, and risk death. As a civilian, with the advent of war in the air, there was the possibility of a bomb landing on your house, or that Britian would be successfully invaded. Nobody could feel safe or confident in the future.
Do I like the songs ? No, but I also have an intense dislike of "Danny Boy". But Vera Lynn motivated forces, stood as an emblem of what was being fought for, and represented the Nation and the war effort. A truly great symbol of British resolve. Any X-Factors winners up for this ?