Singer pays tribute to the way his bandmate has dealt with cancer
Original drummer did not reunite with bandmates for new album '13'
She will return as a judge on the X Factor this year
Band split from drummer Ward while making new album '13'
The metal legends' new album '13' is currently topping the Official UK Album Chart
Meanwhile, Robin Thicke's 'Blurred Lines' remains Official UK Number One Single
Sabbath's comeback album '13' is narrowly ahead of Beady Eye's 'BE' in race for the top spot
Producer says working with the Birmingham rock legends was a 'magical experience'
The band's eagerly-anticipated new album is finally released today (June 10)