There are a number of businesses that accept cash, VATless cash, it's just a part of life, builders are the main ones blamed for this, the truth is that their businesses are the most scrutinised by the revenue, the story about £50k a year in cash is just ridiculous, think about that, you can't pay for your mortgage, rent, car loan, holiday or anything substantial with that amount of money, the odd meal out maybe, some decent punts, but you'd need to be eating out every night and wearing your dick away to get rid of a grand a week. And that's all part of the story that's often left unsaid, people with cash spend it, pay a man a grand in the bank and much of it will stay there, pay him in cash and he'll spend it, the economy works by having money changing hands, you don't just pay that tax once, VAT and income tax is secured every time you hand it over. Start with £100, 20% VAT immediately, 25% income tax and that's already only £60, the next time it changes hands there's only £35 left. Cash is good, and the government knows it.