Kelvin posted pictures with his fellow guest stars Laura Aikman, Faye Mckeever and Jason and joked that they looked more like holiday photos.
“Ok so I know these look like holiday snaps but honestly we did work! As hopefully you will all see tonight 9pm BBC 1,” he wrote online ahead of the show.
“I had the most amazing time and made some friends for life,” the former soap star added.
“From climbing an (active) volcano to kayaking to a deserted island we all fell in love with the beautiful Island of Guadeloupe. At times my belly hurt with laughter.
“Honestly what a dream team to work with @jasonmanford @lauraikman @fayemckeever @holliejedwin #deathinparadise.”