Fixed-term Parliaments Bill

My Lords, I do not know whether the noble and learned Lord, Lord Wallace, is getting tired or whether I am. He has ample reason for getting tired because he has been heroic as the only Minister dealing with this vital constitutional Bill. However, I simply did not understand what he said. We had a general election in May last year and he said that in order to adjust to the situation where we know the date of the next general election, which will be five years from last May, the length of this Session of Parliament had to be adjusted to accommodate that. I do not understand that argument.