But after one of the passers-by reported his routine on Sunday afternoon, Mr Ledger was arrested on suspicion of racially aggravated harassment.

‘We were performing Kung Fu Fighting, as we do during all our sets,’ he said.

‘People of all races were loving it.  Chinese people have never been offended by it before.

‘But this lad walking past with his mum started swearing at us and making obscene hand gestures before taking a picture on his mobile phone.

‘We hadn’t even seen them when we started the song. He must have phoned the police.’

Officers later called Mr Ledger while he was eating in a Chinese restaurant to arrange a meeting.

The singer assumed it was a prank – but he was later arrested and is still under investigation.

‘They seemed pretty amazed but said the law is the law and it was their duty,’ he is reported to have said.

‘It’s political correctness gone potty. There are plenty of Welsh people at our shows – does it mean I can’t play any Tom Jones?’