Barlow will appear on P&O’s Spain and Portugal cruise departing Southampton on 29 October and its Spain, Portugal and Canary Islands sailing, also departing Southampton, on 12 November.

All proceeds from ticket sales for the shows will be donated to Child Bereavement UK and the Teenage Cancer Trust. 

Barlow is a P&O Cruises brand ambassador and the music director of Iona’s 710 Club.

“One thing I love is making memories," said Barlow. "I think music does that extremely well. I look forward to joining guests onboard Iona later this year to create some truly special holiday memories.”

P&O Cruises president Paul Ludlow added: “It is a real delight to welcome Gary back on Iona for what will be extraordinary performances.

"His love of music, which has taken him on so many journeys and adventures, will provide guests onboard with a unique night of world-class entertainment fused with an amazing travel experience.”