1. The Great Britain's nuclear potential

2. Nuclear Plants 15 operational nuclear reactors 7 nuclear plants
14 advanced gas-coolde reactors (AGR)
1 pressurised water reactor (PWR)
produce 1/4 of country's electricity as of 2016
Nuclear power in the United Kingdom generates around a quarter of the country's electricity as of 2016, projected to rise to a third by The UK has 15 operational nuclear reactors at seven plants (14 advanced gas-cooled reactors (AGR) and one pressurised water reactor (PWR)), as well as a nuclear reprocessing plant at Sellafield. On the image there are red and gray dots. Red dots mean active nuclear plants, and gray mean closed plants.
The first station to be connected to the grid, on 27 August 1956, was Calder Hall, although the production of weapons-grade plutonium was the main reason behind this power station.

3. Nuclear Warheads
In October 1952, the United Kingdom (U.K.) became the third country to independently develop and test nuclear weapons.

4. Nuclear Warheads
~216
The U.K. had a stockpile of 215 thermonuclear warheads, of which 120 were operational, as of 2016, but the country has refused to declare the exact size of its arsenal.

5. Nuclear Warheads #1 Operation Hurricane #2 G2 (98 kilotons)
The United Kingdom tested its first nuclear weapons in Australia during the 1950s, on the Montebello Islands and at the Woomera Prohibited Area.
The first detonation, codenamed Operation Hurricane, occurred on 3 October 1952, in a shallow bay on Trimouille Island. Two further tests were held on the Montebello Islands during The second of these, codenamed "G2", included the largest nuclear explosion in Australia, with a yield of 98 kilotons.
Seven further nuclear tests were conducted on the Australian mainland between 1955 and 1963, within the Woomera Prohibited Area, at Emu Field and Maralinga in South Australia.

6. Nuclear Defense Ballistic Missile Early Warning System (BMEWS)
Defense Support Program (DSP)
The UK has relied on the Ballistic Missile Early Warning System (BMEWS) and, in later years, Defense Support Program (DSP) satellites for warning of a nuclear attack.
The ballistic missile threat is perceived to be less severe, and consequently less of a priority, than other threats to its security.

7. Reference Grzegorz Kupczyk 4Ei
Grzegorz Kupczyk 4Ei