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In page Westland Whirlwind (fighter):

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The first Whirlwinds went to 25 Squadron based at North Weald. The squadron was fully equipped with radar-equipped Bristol Blenheim IF night fighters when Squadron Leader K. A. K. MacEwen flew prototype Whirlwind L6845 from RAF Boscombe Down to RAF North Weald on 30 May 1940.[8] The following day it was flown and inspected by four of the squadron's pilots and the next day was inspected by the Secretary of State for Air, Sir Archibald Sinclair and Lord Trenchard.[citation needed] The first two production Whirlwinds were delivered in June to 25 Squadron for night-flying trials.[9][10] It was then decided to re-equip 25 Squadron with the two-seat Bristol Beaufighter night fighter, as it was already an operational night fighter squadron.[11]