One of the UK's few remaining D-Day veterans has been celebrating reaching his 100th birthday, which he puts down to "keeping very fit" all his life.Family and friends gathered at the home of John Roberts and his wife Gillian in Whitstable, Kent, as he opened his birthday card from the King and Queen.The great-grandfather joined the Royal Navy at the age of 13 and served until 1978 having reached the rank of rear admiral.On D-Day, as a 20-year-old sub-lieutenant, he was serving aboard the destro

One of the UK's few remaining D-Day veterans has been celebrating reaching his 100th birthday, which he puts down to "keeping very fit" all his life.Family and friends gathered at the home of John Roberts and his wife Gillian in Whitstable, Kent, as he opened his birthday card from the King and Queen.The great-grandfather joined the Royal Navy at the age of 13 and served until 1978 having reached the rank of rear admiral.On D-Day, as a 20-year-old sub-lieutenant, he was serving aboard the destroyer HMS Serapis at the front of the convoy arriving at Sword beach at 7.30am with the ship remaining to fire on German positions along the coast for 11 days.