A four-year-old boy ran 26 laps of his garden for charity just a day after leaving hospital where he underwent chemotherapy for his brain tumour.

Little Otto Reeves, who was diagnosed with a medulloblastoma brain tumour last summer, was determined to complete the national 2.6 Challenge for charity on Sunday.

His family were not sure he would be out of hospital in time following his latest round of chemotherapy - but he vowed that if not, he would do 26 squats on the ward instead.

However, a delighted Otto was able to complete his own "garden marathon" at his home in Winchmore Hill, north London, on Sunday - having been discharged the day before.

The determined youngster completed the 26 laps around the garden, to raise money for Brain Tumour Research as part of the national 2.6 Challenge and has so far raised £1,140.

The challenge saw people up and down the country taking part in any exercise of their choosing - as long as it had the number 26 in it.

Otto's proud mum Amy Reeves, 37, said: "We are extremely proud, and always amazed by Otto.

"We are extremely grateful to the NHS and everything they have done and continue to do for our family.

"We are still able to continue treatment at Great Ormond Street Hospital despite the coronavirus epidemic.

"We know that it is thanks to scientific research that Otto is able to have such effective treatment and we were over the moon to discover his latest scan was clear."

Otto has now completed 13 out of 16 courses of chemotherapy.

He became became unwell on a family holiday to Disney World last summer with mum Amy, dad Thomas, 39, and big sister Tilly, seven.

When the family returned home, Otto saw several doctors before he was referred for a scan.

His family was devastated to learn he had a medulloblastoma the size of a peach in the back of his brain.

He underwent surgery in September, which was successful in removing most of the tumour, and started chemotherapy in mid-October.

Amy said: "Otto’s treatment means he has suppressed immunity and is therefore classed as high risk of contracting the virus.

"We were already practicing social distancing before the lockdown and have been lucky to get priority delivery slots for groceries, so we are doing OK.

"Measures at the hospital mean that only one parent can now accompany Otto when he goes in for treatment.

"But we view this as a minor sacrifice compared to what so many people are going through at the moment."

Brain Tumour Research spokesman Hugh Adams said: "It’s impossible not to be touched by this little boy’s story and, sadly, Otto is not alone.

"Some 16,000 people are diagnosed with a brain tumour every year.

"But despite the fact they kill more children and adults under the age of 40 than any other cancer, historically, just one per cent of the national spend on cancer research has been allocated to this devastating disease.

"Like many organisations, the coronavirus pandemic has meant a massive financial hit for us and we are anticipating the loss of 50 per cent of our annual income in just three months.

"We are grateful to Otto and his family and the many others who are helping us by taking part in The 2.6 Challenge, on what would have been the day of the Virgin Money London Marathon."