No, my strong suspicion is that this is all about Mr Tony and the precise timing of the announcement of his wretched retirement date.
Had the Glasgow gathering taken place as planned, the Prime Minister would have been under enormous pressure to use it to name the precise date on which he plans to leave office.
Furthermore, he would have had to make yet another farewell speech to the party faithful, which would inevitably have been something of an anti-climax on top of last week's tour-de-force in Manchester at which he bade Labour what sounded like his last goodbye.
The general consensus after Manchester was that Mr Blair's speech had earned him the right to depart slightly later than originally expected - say the end of July as opposed to the May 31 date that was
Postponing the Spring conference may give the Prime Minister just that a little bit more legroom to enable him to hang on till the beginning of the summer recess.