For the first four months, radio receivers were permitted and people could listen to the BBC. Then, following a preliminary commando raid when two men were trapped in Guernsey, 8,000 radios were confiscated and handed in within Guernsey alone. It was easy to identify owners as almost everyone had a BBC radio licence. Returned in December 1940 they were again confiscated in June 1942 for "military reasons" a coincidence that it followed a devastating raid by 1,000 bombers on Cologne.