Britain is heading full throttle for a total write-off of Brexit if it continues with Theresa May’s disastrous plans for the Irish Border, Boris Johnson has claimed.

The backstop deadlock is being used to force the UK into becoming a vassal state and the talks are on course to end in a “spectacular political car crash”, according to the former foreign secretary.

Mr. Johnson said the European Union’s fallback position for the Irish border would mean Northern Ireland was “annexed” by Brussels.

Alternative plans set out by Mrs. May would “effectively” keep Britain in the bloc, he added.

However, the PM has said the counter-proposal to her Chequers plan is “still a hard Border” and hers is the only way that does not “carve up the United Kingdom”.

Mrs. May also warned that the only alternative to Parliament passing her proposals would be no-deal.

It has been reported that the EU is preparing to accept use of technology to avoid the need for new Border infrastructure.

Mr. Johnson has backed proposals by the pro-Brexit European Research Group that physical checks can be done away from the Border, without keeping the UK or Northern Ireland tied to EU customs rules.

Writing in The Daily Telegraph, he said: “If the Brexit negotiations continue on this path they will end, I am afraid, in a spectacular political car crash.”

“If we are to get out of this mess, and get the great British motor back on track, then we need to understand the Irish backstop, and how it is being used to coerce the UK into becoming a vassal state of Brussels,” he added.