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Many thanks for your help, but I am now lost int he right hand corner!
6D S?N?????M Unexpected report from out of the blue? (5,4) is the answer 'sonic boom'?
16A I?E?O??? Diamonds ready? That'll take the heat off (3,5) is the answer 'ice lolly'?
7D O?T???? The best man's put on a stone (7)