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Thanks Answerprancer, but I could never bring myself to confess to them what I've done. Deep down I wish I could, just so I could at least put them in the picture and be prepared for any questions, but I'm too much of a coward to.
Elvis, I too might shop the fella down the road that I only knew in passing of car tax dodging, because like you say we pay, so why shouldn't he? But this is slightly different, it's a friend, someone I know, someone who's been desperately trying to get work.
This job came their way and the opportunity to earn a bit of cash on the side was put before them - I guess it's hard to say no, even though it's wrong, especially when he's eager to earn and the wages alone aren't enough to live on.