Listeners to the show seemed to agree. One said that "Optimus Prime would be one hell of an advisor to the PM. He stands for honour and justice and I would vote for him as Prime Minister if he were real."
Personally I think that if Mr. Brown is heartfelt about his admiration for Optimus Prime, that the British people are generally in good hands. Not too many mythic figures from the past few decades that are as virtuous and upstanding as Optimus Prime.
Thanks to Phillip Arthur for passing along the story!