Is Ed Milliband a robot?

I've just caught up with an interview that Ed Milliband gave to the BBC regarding the public sector workers' strike on Thursday. Now, I know that politicians don't always answer the question they're asked, often taking a particular line and sticking with it. But watch this clip (it's less than three minutes long) and see what you think:



Unless my ears deceive me, Milliband answers five different questions using a combination of the same four phrases , wording them more or less identically each time:

These strikes are wrong at a time when negotiations are still going on

(Five times)

Parents and the public have been let down by both sides

(Four times)

The government has acted in a reckless and provocative manner

(Five times)

I urge both sides to put aside the rhetoric, get round the negotiating table and stop it happening again

(Five times)

Does Milliband really not have anything spontaneous to say or is he too scared of a gaffe to deviate in any way from the script he's prepared beforehand?