Tens of thousands of protesters have taken to the streets of London to show their opposition to the renewal of Trident.
Anti-nuclear protesters from across the UK armed themselves with placards and banners as they braced the bitter winds whipping around the centre of the capital to spread their message.
Demonstrators met at Marble Arch this morning before beginning their march along Park Lane and via Hyde Park Corner, Piccadilly, Piccadilly Circus, Regent Street, St James’ Park and Pall Mall.
Among those leading the front of the march, which ends in Trafalgar Square, was SNP leader Nicola Sturgeon.
The march, organised by the Campaign for Nuclear Disarmament (CND), aims to show the Government how many are opposed to the replacement of Britain's nuclear weapons system.
The CND want to see the money used for Trident invested in housing, healthcare and education and want "a world without nuclear weapons".
The Ministry of Defence has estimated acquiring four new submarines to carry the Trident deterrent will cost £31 billion over the course of the 20-year procurement programme, with a further £10 billion set aside to meet any additional unexpected cost increases.
Addressing the crowd as the rally continued to gather in Trafalgar Square, Ms Sturgeon described Trident as "immoral" and "impractical".
She said: "It is the norm in the world today to be nuclear-free. It is the exception to the rule to possess nuclear weapons, let that ring out loudly and clearly.
"The use of nuclear weapons would bring about human devastation and suffering on an unimaginable scale."
She said the SNP would be making Trident a political issue at forthcoming elections.
Former Green Party leader Caroline Lucas described nuclear weaponry as "a cold war relic".
She said: "To contemplate using nuclear weapons is both illegal and immoral."
Saturday's demonstration is believed to be the largest of its kind for a generation.
Additional reporting by Press Association.
