Quite literally, all he kept saying were the words "doing nothing". Is that the extent of his brieifngs prior to PMQs? "Don't worry Gordon, if in doubt just slap the "doing nothing" line out, the more we sya, the more people will believe it". It wouldn't have happened with Blair.
One thing is for sure, you can really tell that Brown has zero experience of the real non-political world. Unlike Blair who had to become a barrister first and learn to think on his feet, Brown is nothing but a robot that has been fed one brief and boy is he going to stick to it.