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         Frisch-Peierls Memorandum
         UK Decides to Develop Nuclear Weapons
         Aldermaston Airfield Taken Over
         First UK Nuclear Device Successfully Detonated
         Blue Danube Nuclear Bomb Delivered to RAF
         Grapple Series Begins at Christmas Island
         UK/US Agreement
         Red Beard (tactical) Enters Service
         Yellow Sun MK.2 Enters Service
         Blue Steel Nuclear Missile Enters Service
         UK Mounts First Underground Nuclear Test (UGT)
         WE 177 Free-Fall Bomb Enters Service
         First Polaris Subarine - HMS Resolution - Operational
         UK Starts Chevaline Programme
         Pochin Report Recommends Improved Safety Procedures
         HELEN Laser Opened by HM the Queen
         Mogul-D Commissioned
         AWRE Becomes Atomic Weapons Establishment (AWE)
         Government Announces AWE to be 'contractorized'
         Hunting-BRAE Ltd. Awarded Phase 2 Management Contract
         Cray C98D Super Computer Installed
         Plutonium Facility A90 Fully Operational
         North Ponds Water Management System Commissioned
         Fiftieth Anniversary of Opening AWRE Aldermaston
         AWE Management Ltd Win Management Contract
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Yellow Sun MK.2 Enters Service

A Yellow Sun Mk.2 beside a Victor bomber during loading trials in 1962.
A Yellow Sun Mk.2 beside a Victor bomber during loading trials in 1962.

Yellow Sun Mk.2 was Britain's first service thermonuclear weapon; the signing of the 1958 Agreement with the USA gave Aldermaston's designers the opportunity to develop an American two-stage warhead design known as W28.

This design matched the desire for a 'megaton for a ton' device, so was clearly much smaller than its predecessor.

The AWRE version was codenamed Red Snow and fitted into the Yellow Sun casing with plenty of room to spare. Mk. 2 saw service with the RAF from 1961 to 1972.