But I was aided by something that had helped many a more professional burglar before I ever tried my hand at it.

Well," Mason said, "I don't think it was the job of a professional burglar.

I felt no more guilt than that of a professional burglar.

The professional burglars are aware of the system.

A professional burglar would, I am sure, get through this locked door in about ten seconds.

There was always the possibility of busting a professional burglar breaking into a multimillionaire's town house.

In Leeds a professional burglar turns out to be just 13, with a record stretching back to when he was seven.

"These were professional burglars, who would cut the locks in the gates and remove the property," the Sergeant said.

"We don't see many professional burglars anymore," Detective Canson said.

He had read someplace that professional burglars always went in through a door.