Nuclear weapons and the renewal of Trident has been a contentious issue at successive Westminster elections.

The SNP has maintained its scrapping trident policy which has been a core party principle for many years.

The manifesto states “SNP MPs will build a cross-party coalition to scrap Trident as quickly and as safely as possible.”

It states it will back the use of the £205bn cost of replacement on public services, the NHS schools and childcare.

While it is Scottish Labour policy to scrap Trident, the UK Labour policy remains committed to the renewal of Trident, which is the party’s manifesto policy.

Jeremy Corbyn is and has been a long time member of CND and is anti nuclear weapons but he said he backs the party policy voted for at its conference.

He said wants a multi-lateral disarmament. The Scottish manifesto for 2017 states: “Defence is a reserved issue and UK Labour continues to support the renewal of the Trident deterrent.”

Mr Corbyn has bees questioned whether he woluld use nuclear weapons and he has said having to resort to using the nuclear deterrent would be a “failure of the world’s diplomatic system.

The Conservatives also back renewal of Trident.

The manifesto states: “We will retain the Trident continuous-at-sea nuclear deterrent to provide the ultimate guarantee of our security.”

It says it will meet the NATO commitment of spending 2% of GDP on the defence budget.

The Liberal Democrats manifesto on defence doesn’t mention renewal of trident by name but said it would maintain a “minimum nuclear deterrent” and would replace the “continuous at sea deterrent” with “unpredictable and irregular patrolling patterns”.