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Working out if I should be registered as self-employed in the UK
Being self employed just means you fill out some more forms in your annual self assessment for your "profit" from being self employed.  Profit = all the money you receive, minus any tax deductible cost that you spent for making that money (and all the cost must be documented, which means you have a folder with all the receipts and keep it safe). You pay normal income tax on all the profit, which means it is just added to your taxable income. What you do with the profit is up to you; you don't pay yourself a salary, just take the money (make sure you leave enough to pay your taxes).