Burham said the UK’s response and “could send a dangerous signal to Russia that our response is too weak”. He said the report was “one of the most shocking and disturbing reports ever presented to parliament”

He suggested the immediate expulsion of every FSB operative in the UK and strengthened economic sanctions.

The shadow home secretary at the time of the murder, David Davis ,said the report meant that in a civil UK court Putin would be found guilty of complicity in murder. He said “we need to go after the financial assets of Putin in the Bahamas and in Cyprus. Eventually you get to a point when with a dictator you have to draw a line as we did in the Thirties”.

The former Labour culture secretary Ben Bradshaw said: “When is the government going to take meaningful action against the dirty Russian money and property here in London that sustains the Putin kleptocracy, and when is the government going to implement the will of this House - passed overwhelmingly in 2012 - in favour of a Magnitsky-type legislation”.

Another former Labour shadow minister, Mary Creagh, urged the government to take action at the level of the United Nations Security Council, something that was rejected by May.

The SNP’s Peter Grant said “The report I think leads to only one possible conclusion - we now have to regard the Russian government, the Russian state as an organisation actively involved in the commission, funding, supporting and directing acts of terrorism against UK citizens within the United Kingdom.”