No. 90 (Signals) Group RAF

No. 90 (Signals) Group RAF was a specialist formation within the Royal Air Force responsible for providing critical signals intelligence and electronic warfare capabilities. Established during the Cold War, it played a pivotal role in national security, operating advanced systems to monitor, intercept, and counter electronic signals. The group's work was integral to the UK's intelligence community, often conducted in close cooperation with agencies like GCHQ and within the framework of the UK-US Security Agreement. It was ultimately disbanded as part of wider restructuring of the RAF's support functions.

History

The group was formed on 1 April 1968, as part of a major reorganization of RAF signals units under the command of RAF Strike Command. Its creation consolidated various signals intelligence and electronic support measures assets that had been developed since the Second World War, particularly those evolved from the work of the Wireless Intelligence Development Unit. Throughout the Cold War, it was a key component of the Western Bloc's intelligence-gathering efforts against the Warsaw Pact, operating from numerous stations within the United Kingdom and overseas. The group was disbanded on 1 April 1996, with its remaining functions and units redistributed to other formations within the RAF and the newly established Joint Service Signals Organisation.

Structure and organization

The group was headquartered at RAF Rudloe Manor in Wiltshire, a site with a long history in signals intelligence. Its operational units were primarily composed of dedicated Signals Units stationed at key locations, including RAF Digby in Lincolnshire, RAF Wyton in Cambridgeshire, and RAF Boulmer in Northumberland. These units often worked in direct support of, or were co-located with, stations run by GCHQ, such as those at Morwenstow and Culmhead. The group's structure included both fixed-site monitoring stations and mobile detachments capable of deployment with other RAF formations, such as those under No. 38 Group RAF.

Role and responsibilities

Its primary role was the acquisition of signals intelligence through the interception and analysis of foreign military and governmental communications and radar transmissions. This involved communications intelligence and electronic intelligence gathering against potential adversaries. A key responsibility was providing tactical electronic warfare support to RAF operational commands, including jamming enemy radar and communications during exercises and potential conflicts. The group also had a vital function in cryptography and secure communications, contributing to the protection of RAF and NATO networks.

Equipment and technology

The group operated a wide array of sophisticated ground-based and airborne interception systems. These included large fixed direction-finding installations and mobile units fitted with advanced receivers and spectrum analyzers. For airborne signals intelligence, it was associated with aircraft such as the Nimrod R1, operated by No. 51 Squadron RAF, and earlier platforms like the Comet and Canberra. Its ground stations utilized extensive antenna arrays and computer processing systems, with technology often developed in conjunction with the Royal Signals and industry partners like Plessey and Marconi Company.

Notable operations and deployments

While much of its work remains classified, the group was continuously engaged in monitoring Warsaw Pact activities throughout the Cold War, including during periods of high tension such as the Soviet–Afghan War and Able Archer 83. Its units provided direct support during the Falklands War, gathering intelligence on Argentine Air Force communications and radar. Personnel and mobile systems from the group were routinely deployed to RAF Akrotiri in Cyprus and other overseas locations to support RAF operations and NATO exercises across the Mediterranean and Central Europe.

Commanding officers

Notable officers who commanded the group included: * 1968–1970: Air Commodore J. B. Russell * 1970–1972: Air Commodore A. F. C. Hunter * 1972–1974: Air Commodore J. H. L. McRobert * 1974–1976: Air Commodore D. J. P. Lee * 1976–1979: Air Commodore W. J. I. Croydon * 1979–1981: Air Commodore E. B. G. Smith

Category:Royal Air Force groups Category:Signals intelligence Category:Military units and formations established in 1968