Jeremy Vine's brother Tim really is a witty man. (Sack Marcus and Mitch and bring in Tim, Radio 4!)
Here's one of his jokes:
Burglars have become very clever recently. Just last night my wife turned to me in the middle of the night and said, "Wake up! There's somebody downstairs!" So I got out of bed and quietly checked every room.
Suddenly I realized that I don't have a wife.