Your travel is paid for, wont cost you a dime. You can turn up, clock in and go home for £300 a day, every day, easy money. If you'd already been exposed as a greedy, self serving criminal, I wouldn't be at all surprised if that's exactly what you did. Occasionally helping pass the odd law, like making the feckless unemployed work for their benefits of £70 a week (without expenses).
I've heard a radio interview with the guy since, he was claiming he couldn't eat and heat on £300 a day. Said it with no sense of irony whatsoever. Tories have lost a good one there.