Gordon Brown has used his last speech in the Commons to vow he would "fight and fight and fight again" to renew the Union, as he accused David Cameron of mimicking nationalist tactics to divide Scotland and England.
The former Labour Prime MInister, credited with a key role in last year's No vote, warned that the Union was still at risk as he said the UK was "potentially at a point of departure".
His main criticism was of the Conservative leader, who announced plans to restrict Scottish MPs voting rights an hour after the referendum result last September.
Mr Brown said Mr Cameron was attempting to buy votes for the Tory party .
The proposal was not "English votes for English laws," so much as "English laws for English votes," he said.
And the move was a "direct nationalist appeal" , he added.
He also told MPs he believed that voters were interested in a more caring, less selfish vision than that contained in the "me too, me first, me now, me above all, me whatever" manifestos.
His comments came during a session of farewell speeches by MPs standing down in May.
The outgoing MP for Kirkcaldy and Cowdenbeath said: "I leave this House feeling a huge amount of gratitude, but also with some concern.
"I sense that the UK today is fragile, it is at risk and we are potentially at a point of departure.
"Countries at their best, their strongest, their truest, are more than places on the map, they are more than a demarcation of borders.
"Great countries stand on shared foundations. They are guided by unifying ideals. They move forward in common purpose.
"And so it must be in Britain, and whatever the future in the constitutional revolution that is now under way, I will fight and fight and fight again to renew and reconstruct for a new age the idea of Britain around shared values that can bring us together and advance a common Britishness.
"A shared belief in tolerance, in liberty and fairness that comes alive in unique British institutions like the National Health Service and in common policies for social justice.
"And it's because I believe in Britain's future that I'm saddened, and I'm really sorry to have to say this, that for the first and only time in 300 years of the Union it has become official government policy to create two classes of elected representatives in this House."
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