London:- Singer and TV star Cilla Black has left more than £15.2m of her UK estate to her sons, according to her will.The Liverpool-born performer died of a stroke aged 72 after a fall at her Spanish villa last year.The beneficiaries are listed as her children Robert, Ben and Jack Willis with a further £20,000 left to Penelope Walker, understood to have been her long-standing housekeeper.Black’s husband Bobby Willis died of cancer in 1999 and she never remarried.–COT