LONDON - BRITAIN'S Prince William said his boyhood dream had been to be a policeman and that he has a 'Harry Potter scar' as a result of a golf accident when he was a child.

The 27-year-old prince, second-in-line to the British throne, also bragged in an interview broadcast on Wednesday that he would beat his younger brother Harry in an arm wrestling match.

'A long time ago I wanted to be a policeman, when I was younger,' the prince told Alice, a 10-year-old cancer patient at London's Royal Marsden Hospital where he is a patron, in the interview for the BBC children's programme 'Newsround'.

'I soon learnt that probably wasn't a good idea.'

William is currently training to be a full-time pilot with the Royal Air Force's Search and Rescue Force after transferring from the Army where he was a lieutenant.

'It's going very well. My instructors would probably say, 'Not so well', but I think it's going not too badly,' he said.

The prince also discloses how he got his 'Harry Potter scar' on his forehead.

'I call it that because it glows sometimes and some people notice it - other times they don't notice it at all,' he said.

'We were on a putting green and the next thing you know there was a seven-iron and it came out of nowhere and it hit me in the head.' -- REUTERS