Moment Prince William's car races to ailing Queen

STORY: The queen's grandson, Prince William, arrived by plane in Scotland earlier on Thursday (September 8) with her sons Prince Andrew and Prince Edward.

The queen, Britain's longest-reigning sovereign and the world's oldest monarch, has been suffering from what Buckingham Palace has called "episodic mobility problems" since the end of last year.

Earlier officials said heir Prince Charles and his wife Camilla were with the Queen.