Pupils walked 12 miles to raise thousands of pounds for patients being treated for lung and heart diseases at a hospital.

Students at Quainton Hall School, in Harrow raised a “staggering” £8,549 for The Royal Brompton & Harefield Hospitals Charity by taking part in the Grand Canal Challenge, which was organized by Kathryn Beevor, the assistant head.

She was “proud” of her pupils, who were aged between seven years to 13, for taking the cause to their hearts.

Mrs Beevor said: “The amount raised illustrates the generosity of spirit found in our school community.

“I am completely overwhelmed by everyone’s support.”

Abdul, a Prep 7 pupil commented: “It’s a win-win situation, the walk is fun, good exercise whilst raising money to help others.”

Ashley Westpfel, fundraising director at The Royal Brompton & Harefield Hospitals Charity said: “We are hugely grateful for the support from Quainton Hall School.

“The incredible support from the staff, students and parents has been exceptional and we would like to express our heartfelt thanks for their generous donations and commitment to the charity.”