CYCLING siblings set to fulfil their late uncle’s dream, by taking on the ride he never could, have seen their touching tale get the royal seal of approval from Prince Charles.

Schoolboys Sam and Ollie Turner were gob-smacked when a letter from Clarence House arrived on their doorstep – hailing them as an “inspiration”.

The Prince of Wales wished the Brothers on Bikes luck ahead of their 900 mile charity trek from John O’ Groats to Land’s End in just 11 days this month.

Sidmouth College students Sam, 15, and Ollie, 13, were gifted a bike by their terminally ill great uncle, Malcolm Turner, before he died from cancer. Cycling ace Malcolm, 67, had always wanted to ride the length of the UK.

The boys also want to boost the spirits of friend John Massen, 42, who is battling the illness.

“We couldn’t believe it,” they said of their special delivery this week. “It was a pretty big thing.”

Sam and Ollie could be the youngest-ever siblings to complete the cycle challenge. They hope to raise �26,000 to be shared between Sidmouth Hospiscare, Cancer Research UK and Hospiscare Devon. The cash is the typical annual salary of a hospice nurse.

Proud dad Andy, 42, who’ll also be one of five riders to take on the challenge, wrote to Charles explaining his sons’ exploits – but never expected a reply. However, correspondence from Clarence House told him: “His Royal Highness was deeply moved to learn how your sons have chosen to complete such a long ride in memory of their uncle and (in honour of) your friend.

“The training must have been long and arduous which makes the journey Sam and Ollie are taking truly an inspiration.”

The teenagers, who look up to Olympic cycling heroes Bradley Wiggins and Chris Froome, have clocked up 2,500 training miles each to date.

“We’re really excited and looking forward to the ride now,” said Sam.

They’ve received messages of support from the likes of Team GB chief Andy Hunt and have even had their own personal weather forecaster in the BBC’s Emily Wood through Twitter.

“The majority of their training has been in the rain,” said Ollie.

The brothers will set off on August 16.

“We don’t know of any siblings younger than them to do it,” said Andy.

To support the boys e-mail: brothersonbikes@hotmail.co.uk