As a sole trader its easy and rather profitable.

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When you only bank & declare the cheques & transfers it is

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Make sure you only get paid by cheque or BACS then.

Seriously though, you can't moan that public services are rubbish and then pay less tax than you're supposed to. I know there are other factors but if more people played it straight then the frauds might be easier to spot.
It's a bit like when people cried foul about the expenses scandal and they themselves didn't declare their taxes
or expenses properly.
Hello Mr. Kettle, I'm Mr. Pot. And you're black.