During the party Cockbill decided to belly flop into a child's paddle pool which resulted in a compression fracture to his spine leaving him paralyzed from the waist down.

[1] The same year he represented Great Britain at the IPC World Championships, finishing 26th in the R4 - 10m Air Rifle Standing SH2.

[2] In 2011 he entered the IPC Shooting World Cup at Fort Benning in the United States, winning bronze in the R5 10m Air Rifle Prone mixed SH2.

[1] At the 2015 Stoke Mandeville Shooting World Cup Cockbill took six medals, including a gold in the R4 - 10m Air Rifle Standing SH2.

[5] In 2022 at the Shooting Para Sport World Championships he won a Bronze medal in the R4 Mixed 10m Air Rifle Standing SH2 event.