A Cock and Bull Story’s Steve Coogan briefly mentions Kelly and their working relationship in a new interview with Daily Record.

You have Kelly Macdonald playing your girlfriend and mother of your child in this film. Do you make a good couple?
In an interview, she said she wouldn’t be the first in the queue to marry me. I looked at it and I thought ‘that’s not very nice is it?’ But seriously, I felt very comfortable with Kelly. She had a real warmth that was good for my character in the film.