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The head of Boris Johnson’s Downing Street “union unit” has been fired as part of a cull of advisers.

Elliot Roy was reportedly sacked amid claims the Prime Minister’s top aide Dominic Cummings is effectively running the Government.

Johnson and Cummings, who masterminded the Vote Leave campaign, have been accused of centralising power since the general election.

Sajid Javid was offered the job of chancellor again, but turned it down after he was told he would have to sack his team.

Cummings was behind the departure of another of Javid’s aides, who is taking legal action against the Government.

It has now emerged that Roy, who used to be an adviser at the Scotland Office, has also been axed.

He was the hand-picked expert to lead a new unit that was supposed to make the case for Scotland’s place in the UK.

Roy was listed as being the point of contact, but he is said to be another casualty of the Johnson power grab. It is unclear whether he will be offered another job in the administration.

Ian Blackford, the SNP’s Westminster leader, has called on the Westminster Liaison Committee to summon Cummings for a grilling on the reshuffle

“I have written to the Clerk of the Committee calling for Johnson’s de-facto deputy Dominic Cummings to appear before the Liaison Committee over his handling of the UK government’s reshuffle.

“It is clear that the new Johnson government cares as little about the union, as the last Tory government did.

“It’s equally clear that the people of Scotland must have the choice of a better future as an independent country.”

Meanwhile, Downing Street has refused to condemn comments from another adviser who once suggested enforcing the uptake of contraception to stop unplanned pregnancies “creating a permanent underclass”.

Johnson had been under mounting pressure to sack Andrew Sabisky – who was drafted in to Number 10 after Cummings called for “misfits and weirdos” to apply to advise the Government.

The Tory leader was prepared to stick by the advisor but on Monday evening Sabisky announced his resignation amid fierce criticism over his past comments.

Labour said Number 10’s refusal to condemn the remarks was “disgusting”, while Scottish First Minister Nicola Sturgeon said the Government must “demonstrate some basic but fundamental values”.

Sabisky also suggested that black Americans have a lower average IQ than white Americans.

Downing Street repeatedly refused to say whether Johnson supported the views expressed by Mr Sabisky on eugenics - the selective breeding of humans - or the IQ of black people.