text: The parents of young cancer sufferers now expect to be offered the same treatment as Ashya King, one of his doctors has said. Clinicians are in an ‘impossible situation’ as a result of the King family’s flight to Spain after disagreeing with doctors who were treating him in the UK. Doctors and nurses who treated Ashya King have criticised his parents while speaking out for the first time in a BBC documentary. Scroll down for video . Clinicians in an ‘impossible situation’ as a result of King family’s flight to Spain after disagreeing with doctors . Ashya was being treated in Southampton when his parents took him from the hospital and fled abroad without telling staff last year. They ignored medical advice and took him to Prague for proton beam therapy, ultimately paid for by the NHS Trust after he left the UK. Paediatric intensive care consultant Dr Peter Wilson told the documentary: ‘It does put clinicians in an impossible position because we now have to try to explain to families why one child... is getting a form of treatment, why they can’t and they’ve got the same tumour. 'That’s deeply unfair when the NHS is supposed to be about equal healthcare for all.’ After fleeing the UK, the Kings were arrested in Spain and spent several nights in custody after an international arrest warrant was issued against them. Ashya was made a ward of court by Portsmouth council before a national outcry led to their release. His parents Brett, 51, and Naghmeh, 46, wanted him to have cutting-edge proton beam therapy instead which is thought to be less harmful. Because it is so highly targeted they claimed it could avoid healthy tissue, particularly tissues and organs behind the tumour. The family then went to Prague for proton beam therapy, and now say there is 'no evidence' of a tumour . A High Court judge approved the move to take Ashya to Prague for proton beam therapy. The NHS later agreed to fund Ashya’s treatment in Prague. In March, four months after the proton treatment ended, Brett King told a national newspaper a recent scan showed ‘no evidence’ of the tumour. But cancer experts have told the BBC although it appears Ashya is in remission it is far too early to say he has been completely cured. Speaking to the documentary, staff at the hospital said they had been viciously attacked in the wake of the story. Dr Wilson said: ‘As soon as the story broke, and it became a story of a hospital who was chasing down a family, we were inundated. Paediatric intensive care consultant Dr Peter Wilson said it was 'deeply unfair when the NHS is supposed to be about equal healthcare for all’ that he had to say no to parents wanting proton beam therapy for their children . ‘At one stage, especially on the Monday, our switchboard was basically shut because of the number of phone calls we were receiving; the number of messages that were left ... vitriolic messages for everybody. ‘The overwhelming sentiment was one of just an absolute outpouring of hatred. One of the letters said they wished my children got cancer and died.’ Paediatric oncology consultant Dr Ramya Ramanujachar, also involved in Ashya’s treatment, warned the case could set a worrying precedent. She said: ‘I don’t think the parents can look after their own child with a brain tumour and be not only the carers but also the professionals directing, managing and dictating their child’s treatment.’
target: Doctors and nurses have criticised Ashya's parents in BBC documentary .
  Consultant warns case - which saw parents ignore medical advice to take Ashya to Prague for proton beam therapy - could set a worrying precedent .
  NHS agreed to pay for Ashya's treatment, and family now say he is cured .