A man claiming to be able to cure autism has been secretly filmed shouting and threatening to punch or slap an undercover reporter who posed as a patient.

Joseph Kanta offered “autism mind training” and told the reporter he could “cure” autism with his training system.

In the footage obtained by the journalist who posed as a vulnerable patient, Mr Kanta can be seen raising his fist at the client and asking whether he wanted a “slap or punch”.

He is also seen standing over his client and loudly shouting his name.

The BBC reporter filmed the interaction as part of an investigation into a Hungarian firm that was selling a “cure” for autism in London.

Mr Kanta told the undercover reporter his autism could be cured through a series of training sessions which cost £3,500.

According to the BBC, Mr Kanta said he would do this by locating the patient’s “inner trauma” which could take as many as 60 sessions.

The undercover reporter, who gave his name as Jordan said during the sessions he was ordered to make prolonged eye-contact with Mr Kanta, which is something many people with autism find difficult to do.