Quoteand i've been told that everything he wrote down today will be used at a further date to try and trip me up but at least its over.
Not sure who told you that, but if it is the case, then it's just to ensure you haven't been feeding a lot of bull.
It's never a good idea to lie and it's especially never a good idea to lie to professional interviewers.
But, having said that, relax. be yourself. Be honest at all times. Keep focused on what you want.