It probably a good thing this is an alternative history, because The Royals would be full of fallacies if it wasn't.
In real life, Prince George, the Duke of Kent and brother of King George VI, was killed in a plane crash while serving in the RAF in 1942.
King George himself was a served in WWI as a turret officer on the HMS Collingwood, and saw combat in the Battle of Jutland. He served in both the Royal Navy and later in the Royal Air Force.
There would have never been a King Albert, as Queen Victoria asked her descendants never to use the name, as a tribute to her late husband and consort, Prince Albert. (George VI's first name was actually Albert, but he took the name George VI when he became King after the abdication of his older brother, Edward VIII.
The Royal Family were subject to the same rationing restrictions the British public lived under during WWII. Also. the King and Queen were in Buckingham Palace when a German bomb struck the Palace's courtyard.
Of course, it seems that Rob Williams isn't interested in presenting any kind of British Royal Family, fictional or otherwise, in any kind of favorable light. I'm sensing a heavy load of British Socialist anti-Royalist bulls**t.