The 99-year-old war veteran, who has raised £27 million for the NHS so far by walking around his garden 100 times using a walking frame, turns 100 on Thursday, 30 April - and the Royal Mail has announced plans to celebrate his landmark birthday by stamping all letters with a special message.
It will read: "Happy 100th Birthday Captain Thomas Moore NHS fundraising hero 30th April 2020."
The World War Two veteran, from Marston Moretaine in Bedfordshire, has extended his challenge to 200 laps after he completed the first 100 laps 14 days ahead of schedule.
Captain Tom's initial £1,000 fundraising target was smashed in around 24 hours - and he has now raised more than £29m for the NHS.
David Gold, director of public affairs and policy at Royal Mail, said: "What Captain Thomas Moore has achieved is truly phenomenal, and this is reflected in the affection shown for him across the world.
"As Royal Mail works to keep the country connected during these challenging times, we are honoured to issue a special postmark in celebration of his 100th birthday."
On Friday, Captain Tom became the first ever centenarian to top the UK singles chart, after his duet with Michael Ball went straight to number one.
Their cover of the Gerry and The Pacemakers' classic, You'll Never Walk Alone, sold 82,000 copies, with the proceeds going to the NHS Charities Together fund.
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