Conversation so far:
What are some of the songs Gary Barlow wrote?
In July 1996, Gary Barlow released his first single as a solo artist, entitled Forever Love and Sing is a song written by  Barlow and Andrew Lloyd Webber.
Does Gary Barlow have any collaborations?
In December 2011, Gary Barlow performed a duet with Michael Bublé singing Rule the World and Bublé's single, Home.

Question: Did he write any number one hits?
Self-contained rewrite: Did Gary Barlow write any number one hits?