You can start selling as a "sole trader", no paperwork required. If you want to limit your liability just tell an accountant, they can set up a new company in their sleep. Best thing about that is you pay 20% corporation tax on your profits and take your money tax free as a dividend.

Insurance is easy if your business is on the list, employing people is a nightmare. When you form a company you get all the paperwork for that, but if you ring them and promise never to employ anyone they excuse you. Arrange to pay your NI stamp by direct debit, about £12 a month.

I did it, after years of living in fear of "da boss" I don't have one. Sometimes I work all hours, but I don't have to, it's a liberation