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Working out if I should be registered as self-employed in the UK
As 'anonymous' already mentioned, I think the correct answer is to go see an accountant. That said, if you are already have to fill in a tax return anyway (ie, you're already a high rate taxpayer) then I don't see why it should be an issue if you just told HMRC of your additional profit via your tax return. I never was in the situation of being employed with a side business in the UK, only either/or, but my understanding is that registering as self employed is probably more suitable for someone who doesn't PAYE already. I might be wrong on this as I haven't lived in the UK for a couple of years but an accountant would know the answer. Of course in either case, make sure that you keep each an every scrap of paper to do with your side business.