Savoia, according to the report, he was fined for "failing without reasonable excuse to comply with a direction".
He said he'd made a 'precautionary' landing because he was concerned about the clutch light. He was subsequently told, either by his engineer or by the CAA (or both), that the aircraft was unsafe and was grounded until it had been inspected by an engineer (the CAA apparently "issued a notice to that effect"). Having been told this/issued with the notice, he took off anyway. And that decision cost him close on six grand.