BRitual and the EU will spend the weekend on intensive discussions on a new customs plan for Ireland that could lead to Boris Johnson reaching an agreement on Brexit at the crucial Brussels summit this week.

In a context of growing speculation that an agreement might finally be possible, the stock and stock markets rose sharply on Friday after it appeared that the prime minister had offered to compromise on his original Brexit proposal.

It is understood that Downing Street shared the details of the proposed compromise in private with the EU negotiators, which paved the way for the opening of detailed formal discussions before next week's EU leaders meeting .

On Friday, it was speculated that the proposed compromise could see Northern Ireland …