Queen pulls out of jubilee service due to 'discomfort' during Thursday's parade

Britain's Queen Elizabeth II will miss a service of thanksgiving at St Paul's Cathedral for her 70 year reign on Friday

after experiencing "some discomfort" during the first day of her Platinum Jubilee celebration.

The Queen appeared at Buckingham Palace on Thursday during the festivities

and participated in a beacon lighting ceremony from Windsor Castle in the evening.

"The Queen greatly enjoyed today's Birthday Parade and Flypast but did experience some discomfort," Buckingham Palace said in a statement.

Taking into account the journey and activity required to participate in tomorrow's National Service of Thanksgiving at St Paul's Cathedral

Her Majesty with great reluctance has concluded that she will not attend," it continued.

Earlier Thursday, the 96-year-old Queen looked on from the palace's famous balcony

at a sea of red, white and blue as huge, flag-waving crowds flocked to the Mall to see the monarch and her family.