Watch a video report from ITV Anglia's Rebecca Haworth
Thousands of cards have already turned up for Captain Tom Moore ahead of his 100th birthday next week, of which Bedford School has stepped in to help open and store.
The 99-year-old World War II veteran has raised over £28 million for NHS charities by walking laps of his garden.
The money will be used to meet the immediate and urgent needs of patients, staff and volunteers during the coronavirus pandemic. Some of it will also go towards hospices, community healthcare and social care.
The school is expecting around 250,000 cards for his birthday.
Benjie Ingram-Moore, Tom's grandson is also helping to open and store the cards.
Tom is still walking in his garden and raising millions for NHS Charities Together. He's grateful for the 'kind' gestures and says "it really is one of the nicest things that's happened" to him.