Britain has a new Prime Minister as Liz Truss takes over from Boris Johnson and immediately faces crises on the home front and abroad. From the soaring cost of living crisis in UK to Russia's invasion of Ukraine, the new Conservative Party leader is already shouldering an enormous burden of responsibility.
And arguably, one of the biggest decisions Ms Truss will have to make as the head of a nuclear power is what to write in what are widely known as 'letters of last resort'. Four identical letters are handwritten and sent to the Royal Navy commander on board the four Trident nuclear submarines.
The top secret letters set out what actions the commander should take if there is a nuclear attack and the leaders of the UK are killed. It is widely understood that there are four options, although it is not known exactly what they say.
