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Ellipsis - // The prince's lawyers previously rejected claims he had not co-operated, saying he offered to help three times. //
As I said in my OP, it does depend on your definition of the word 'co-operation'.
It's one of those phrases that has multiple meanings, like 'Helping the police with their enquiries … ' which conjures up an image at one end, of someone sitting with the sergeant having a chat and a cup of tea, or an image at the other end, with someone not enjoying a privates / rubber hose interface down in the cells!