I've blogged before about politicians - including President Obama and Ed Miliband - using teleprompters, reading from scripts, speaking without scripts, pretending not to have a script, modelling management guru walkabouts, etc.
In his leader's speech yesterday, Mr Miliband excelled himself by forgetting some crucial lines from the script he had tried to remember. Although his last two efforts to memorise scripts more or less verbatim were hailed by the media as great successes, the last thing you want is for journalists and their editors to concentrate on how you said something rather than what you actually said (or didn't say).
And here lies one of the hazards of 24 hour news and the reporting of speeches before they are actually spoken. If Mr Miliband had not circulated the text of his supposedly scriptless text-free speech, he might have got away with it. But he did not and has had to spend the day reading reports of what he had not said, appearing in broadcast news interviews trying to explain his omissions away, etc.
If I were asked, my advice would be to say that there's little to be gained from trying to memorise long speeches - unless you happen to be David Cameron performing in a 10 minute beauty parade for the Tory party leadership...