Prime Minister Theresa May will kick off the historic process of taking Britain out of the EU with a vow to fight for citizens, including European nationals, and a call for the people of Britain to unite.
May's ambassador to Brussels, sir Tim Barrow, will tomorrow notify the EU of the beginning of Brexit talks around lunchtime, while the Prime Minister remains in the UK to address parliament.
And speaking to MPs tomorrow just one day after the Scottish parliament voted to pursue a second independence referendum, May will say that British people must come together behind their commons goals for Brexit.
"We all want a nation that is safe and secure for our children and grandchildren. We all want to live in a truly global Britain that gets out and builds relationships with old friends and new allies around the world," she will say.
"These are the ambitions of this government’s plan for Britain. Ambitions that unite us, so that we are no longer defined by the vote we cast, but by our determination to make a success of the result."
She will add: "We are one great union of people and nations with a proud history and a bright future. And, now that the decision has been made to leave the EU, it is time to come together."
Similarly, she will promise to fight for "every person in the whole United Kingdom" in her negotiations with Brussels, echoing the kind of rhetoric she employed when first replacing David Cameron as Prime Minister.
But May is also expected to add that she will also fight for "those EU nationals who have made this country their home".
It comes after months of pressure on Downing Street for May to issue a unilateral guarantee of the protection of the rights of Europeans resident in the UK.