Did Tate Modern turn down an offer by Charles Saatchi to donate his collection? Saatchi says yes, Tate no. Now Saatchi says he’s not in the mood. “I lost my chance for a tastefully engraved plaque and a 21-gun salute. And now the mood has passed, and I’m happy not to have to visit Tate Modern, or its storage depot, to look at my art.”