What was a name given to Britain's first operational nuclear weapon?

Question

The "Treaty Banning Nuclear Weapon Tests In The Atmosphere, In Outer Space And Under Water", known as the "Partial Test Ban Treaty", "Limited Test Ban Treaty" and "Nuclear Test Ban Treaty", introduced in 1963, was signed by a number of countries including the UK, the USA and which other?

Answer 1

Blue Danube
The first Blue Danube was delivered to the Royal Air Force in November 1953. The warhead was proof-tested at surface and air-drop trials sites in Maralinga, Australia, by a team of Australian, British and Canadian scientists in late 1956. However it was not suitable for service requirements and was re-engineered.