John, 68, took to Instagram to praise "lovely" Jack Patterson from the Grammy Award-winning group and revealed he has been working with the musician in the studio alongside songwriter Jimmy Napes.
"I love it when friendship springs from artistic collaboration. Jack Patterson with Clean Bandit and I have just been writing in the studio with Jimmy Napes. Jack is a lovely guy and we had fun catching up over lunch," he wrote alongside a photo of himself with Jack.
The group originally met the iconic musician at the Ivor Novello awards in London earlier this year.