THE former de facto Prime Minister of the UK has admitted the Union is at “greater risk now than at any point in my lifetime”.

David Lidington, who stepped down as an MP last year, warned Boris Johnson faces an uphill battle to prevent Scottish independence.

Theresa May’s former deputy also predicted a failure to prepare Northern Ireland for Brexit could put the UK at further risk of breaking up.

READ MORE: David Lidington: No-deal Brexit could seal Scottish independence

He told Business Insider: "My view is the Union is at greater risk now than at any point in my lifetime."

Recent polls put support for Scottish independence at 54%, when don’t knows are excluded, and Lidington said they represent a "worrying snapshot, especially when you see support for independence growing among the younger age group”.

The National:

Johnson has reacted by sending ministers on more visits to Scotland, with Chancellor Rishi Sunak appearing in Glasgow and Bute yesterday.

Lidington said he was “delighted” to see this, adding he’d like to "get to a situation where it was seen as perfectly normal for minsters to go to Scotland, Wales, and Northern Ireland any day of the week”.

He urged Tory ministers to "act and speak in a way that shows acting for and respect all parts of the UK”.

"I've felt for a long time that the problem that is as much English indifference to the value of the Union than it is nationalism,” the former MP explained.

READ MORE: Release of key Scottish independence poll blocked by May's deputy

Lidington went on to say that a failure to properly understand the concerns of Northern Ireland could put further strain on the Union.

The UK Government has pledged additional financial support to businesses in NI ahead of the withdrawal from the EU.

Lidington commented: "I'm pleased that the government has come forward with more detail but if you listen to what Northern Irish business groups are saying, there needs to be a lot more done as they need time to prepare for all of this.”