As Keith has said he hasn't read a book on the subject and refuses to do so because he is not interested, I thought I'd put this up to save him the trouble.
"Britain tore up NOTHING"
Britain secretly alteres the siggnged Bill and his ally in Parliement, Redmond, dscribed it as "a betrayal" - what problem do you have with that fact Teribus?
Jim Carroll

This was the situation regarding the Home Rule Bill in 1914 (even before it had secretly been altered) – from Nicholas Mansergh's The Irish Question 1914-1921 Unwing University Books 1965

"By 1914 the faith of Irishmen in English parties and English promises was dead. The Home Rule Bill which John Redmond had welcomed with a warmth that cloaked anxiety as a 'great measure', was, it is true, placed on the Statute Book in October 1914, but accompanied by an Act. suspending its operation till after the ending of the War and by an assurance of its amendment in respect of Ulster; that division of the nation which Redmond had denounced at Limerick in 1912 as an abomination and a blasphemy', had been the subject of negotiation in which Redmond, under pressure from his Liberal allies, agreed to the exclusion of Ulster for six years as the 'extremest limit of concessions without eliciting any favourable response from his Unionist opponents. It was a concession which the more advanced Nationalists were not prepared to make. 'So long as England is strong and Ireland is weak', was the comment of Sinn Fein, 'she may continue to oppress this country, but she shall not dismember it' In the south there were men who had observed the Ulster rebellion, who had learnt from the organization of the Ulster Volunteers, who had watched the Fanny unload her cargo of arms at Larne. Like Sir Edward Carson the only Irish member of Parliament who has any backbone' observed Irish Freedom,, the newspaper of the Irish Republican Brotherhood—they did not share John Redmond's belief in the wisdom and good faith of majorities at Westminster; like Bildad the Shuhite they answered and said, 'how long will it be till ye make an end of words? '