In late 2006, Best launched a men's fragrance called "Calum",[4] made by Jigsaw ESL.

[6] In 2009, he appeared as a guest judge in the reality television show Paris Hilton's British Best Friend, in which he tested the contestants' flirting abilities.

[8] Calum hosted via webcam an Online bingo session at Bingocams UK on April 20, 2012.

[9] In 2012, he won Ireland's Celebrity Bainisteoir, managing Moy Davitts of County Mayo.

[14] On January 3, 2017, he returned to compete on the nineteenth series of Celebrity Big Brother,[15] in which he finished in seventh place.

[19] In 2022, Best appeared in and jointly won the fourth series of Celebrity SAS: Who Dares Wins.