The King and Queen attend a church service alongside other family members, including Andrew Mountbatten-Windsor's daughters Princesses Beatrice and Eugenie.
He invokes the wartime spirit in his annual speech, delivered from Westminster Abbey.
The pair will oversee the Strictly Christmas Special on Thursday, before bowing out from the show.
An arrangement Rob and Dianne Parsons thought would last a few days ended up changing their lives.
Organisers of some Christmas Day and Boxing Day swims have cancelled events due to the weather.