He is in a stable condition at Derriford Hospital, Plymouth, after an operation in Tromso, Norway.

BBC: Scott Bennell-Smith

The star, whose hits include I'm Outta Love, also suffers from the bowel condition Crohn's disease and had an operation for this at the age of 13 for the illness.

BBC: Anastacia has cancer surgery

He added that her condition worsened after she underwent a further hip operation following a fall at the hospital.

BBC: Gladys Richards