And for those, not just DaveTheGnome, who assume that everything that proceeds from Boris' mouth must be a lie:
Nigel. Boris is a lying scumbag. I have known it for years. Millions of others have known the same. There is a Web site dedicated to it. It has been proven time and time again. The parliamentary committee has confirmed it. There is little doubt that on Monday Parliament itself will ratify it. He cannot help himself. He is a sociopathic narcissist who will do anything for power and attention. I feel sorry for those he has fooled but they should feel no shame as they were conned by masters (a master?).

If he had gone before the committee and said "Ok. you've got me bang to rights" would you have assumed he was lying and exonerated him?

There is a problem with assuming that someone you know has lied before is automatically lying (unless it happens to agree with your own preconceptions).