The newly-appointed BBC Director-General Tony Hall said, "It takes a lot to drag me away from the Royal Opera House ... but the reason I stand before you today is that I care passionately about the BBC, about what it can do, it's programme makers and the impact we have in all different ways".
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Marjorie and Michael Cawdery, both 83, are understood to have been stabbed to death in a killing their family called "incomprehensible".
Detectives have launched a murder investigation following the shooting in Brent, north west London on Friday night.
Hot and humid throughout the Bank Holiday Weekend.