NEW Chancellor Rishi Sunak may delay the date of next month's Budget in order to give himself more time to prepare, a senior minister has said.

Transport Secretary Grant Shapps said ministers had still not been told whether the Budget would go ahead on March 11 as planned after Sajid Javid's resignation.

"I know that the Budget plans are well advanced but I also know that Rishi Sunak, the new Chancellor may want time," Shapps told Sky News's Sophy Ridge On Sunday programme.

"I haven't heard whether the date of March is confirmed as yet. He is probably looking at it, I should think this week."

READ MORE: Kate Forbes joins devolved governments for urgent Budget talks

The delay to the UK Government’s Budget meant the Scottish Government was in the unusual position of setting out spending plans in its own budget without knowing exactly what money was coming to the country’s block grant through the Barnett formula.

Kate Forbes said the proposals contained in her Budget were based on promises of spending made by the Tory Government. This could lead to problems, if the UK Government didn’t live up to its promises.

Another delay is likely to lead to further uncertainty over the Scottish budget as a result.

Sunak, previously the Treasury chief secretary, was catapulted into the top job after Javid dramatically resigned in last week's Cabinet reshuffle.

It followed a series of well-publicised clashes between Javid and Boris Johnson's chief adviser Dominic Cummings, who was reportedly pressing for the Treasury to relax constraints on public spending.

Shapps however denied that Cummings was now "all powerful" in Whitehall.

He pointed to last week's decision to give the go ahead to the HS2 high speed rail link - a project Cummings was known to oppose.

"It is not the case that things necessarily go Dominic Cummings' way or anyone else's," he said. "Take HS2, a big decision that Dominic had views about, I had views about.

"We discussed it, we discussed our various views, and we came to a conclusion. The idea that just because Dominic thinks something, that's what happen is clearly not the case."