I seem to remember that he stole a car from Debbie's garage to try and catch Diane before she left for Brighton, however long ago that was. He was caught by the police on the way. I'd imagine that has something to do with it, but not 100% sure.
Did anyone esle notice that Diane was NOT in Margate tonight? she was clearly in a large park in Yorkshire (some where near Hull) - there is no where like that in Margate