File photo dated 01/12/15 of Madonna performing on stage during her Rebel Heart tour at the O2 Arena in London, as the pop star has criticised a concert venue after the power was cut during her encore. PRESS ASSOCIATION Photo. Issue date: Monday December 21, 2015. The Glasgow leg of her latest tour is said to have started late at the SSE Hydro and ran over the planned time. See PA story SHOWBIZ Madonna. Photo credit should read: Ian West/PA Wire