Bonar Law's quote, given before an army of Orangemen in 1913, demonstrates the tension that had arisen over the passage of the Home Rule Bill. Of course, in our timeline Franz Ferdinand was shot, the wheels start in motion, WWI, the Easter Rising etc, etc.
There have been innumerable alternate WWI timelines. However, this is one possibility I don't believe has ever been brought up. If we delay the war, even by a year, we can have Home Rule enacted. An armed Orange insurrection in Ulster, supported by the Tory party, would square of against Redmond's constitutionalists, long allies of the Liberals. Added to this mix would be the IRB and Sinn Fein, those groups that would become the Anti-Treaty forces in our timeline, viciously opposed to both sides.
This would appear to be the South African War writ large. Indeed, Peter Clarke has hinted that this was the issue which could have set Britain's waning aristocracy, scarred by trade, taxes and the Parliament Act, into open rebellion against the Liberal government.
So what so what do we think? Save Franz (easy enough), give it a year at least, and give Britain a civil war by proxy in Ireland? Worth giving a go?