Who ran with derek ibbotson when he broke the 4 minute mile?

When Derek Ibbotson broke the 4-minute mile on July 4, 1955, he was paced by his training partner, Brian Hewson. Ibbotson completed the mile in 3 minutes and 59.4 seconds at the White City Stadium in London. The pacing by Hewson was crucial in helping Ibbotson achieve this historic milestone.