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A charity which was given £50,000 in donations to pay for treatment for sick Ashya King has reportedly refused to give his family any of the money.

Kids 'n' Cancer UK said it would spend the cash on other children as the NHS has said it will fund Ashya's treatment and the Kings have received money from online appeals.

The charity has been criticised by Ashya's brother for not using the money to pay the family's legal fees - but Kids 'n' Cancer said it could not legally give the cash to meet those costs, the BBC reports.

Five-year-old Ashya was being treated for a brain tumour at Southampton General Hospital in August 2014 when he was 'taken' by his parents Brett and Naghmeh without the consent of doctors.

Seeking alternative treatment for their son the couple fled to Europe with their family, sparking an international police search.

They were eventually arrested in Spain on August 30, and Ashya taken to a hospital in Malaga.

Ashya was flown to Prague to have proton beam therapy at a Czech clinic, which the NHS agreed to fund on 26 September.

Mike Hyman, chief executive of the Kids 'n' cancer charity said the Kings had raised substantial amount of money online, as well as from a deal with a national newspaper.

"The Kings asked us to pay their legal expenses, which we cannot legally do," he said.

"There has obviously been a significant amount of money raised and I reiterate that Kids'n'Cancer were prepared to underwrite £100,000 to pay for Ashya King's treatment.

"There are many families who are not as fortunate with the fundraising as the Kings. We always try to make a difference and the money will be used to assist other sick children."

(Image: Facebook)

"Kids N Cancer came back with a reply saying that they were not willing to help us, they said we are greedy asking for help... Kids N Cancer have never given us any money and they are refusing to help us now."

Ashya's brother Naveed King, posted on social media: "We have asked Kids N Cancer to support us with paying for the legal fees involving the custody and the release of my parents from prison as well as living expenses whilst we are in Prague.

"Kids N Cancer came back with a reply saying that they were not willing to help us, they said we are greedy asking for help... Kids N Cancer have never given us any money and they are refusing to help us now."

Ashya's dad Brett talks outside Proton Therapy Centre in Prague