600 (City of London) Squadron RAuxAF was formed at RAF Northolt on 14 October 1925 as a unit of the Auxiliary Air Force,[4] equipped with Avro 504 trainers and Airco DH.9A day bombers.

In November 1942, 600 Sqn moved to North Africa to provide night cover for Allied bases and shipping.

It was transferred to Malta in June 1943, and in September, to Italy where it spent the rest of the war on night defence and intruder missions.

[18] On 10 May 1946, 600 Sqn reformed at RAF Biggin Hill, as a day fighter squadron of the Auxiliary Air Force with Spitfires.

Since 1999, the Squadron has provided initial and professional training to part-time reservists in a variety of RAF ground trades – Operations, Intelligence, Personnel Support, Nursing, Medical & Logistics among others.

Many 600 Squadron reservists have had the privilege of literally making the headlines – from exercises in Africa, the Middle East and Malaysia, to front-line operations in Iraq, Afghanistan the Falkland's and further afield.