Changing lightbulbs

Went to the Parliamentary Group for Energy Studies reception last night. Many interesting conversations and one amusing joke. John Healey, Financial Secretary to the Treasury, attributed the following to his 11-year old son:

Q. How many nuclear engineers does it take to change a lightbulb?
A. Seven. One to install the new bulb, and six to manage the old bulb for the next 10,000 years.

He said a lot more about the Energy Review, but with great professional skill, I can only remember the joke. Interesting views from energy companies on whether the Energy Review does enough to initiate a nuclear new-build programme, tending to confirm my hunch that the new planning, licensing and waste commitments wouldn't be enough.