While Americans, Canadians, Australians, New Zealanders and nationals from certain other countries can usually enter the UK visa-free as tourists, this does not give you the right to work.If you're caught working without the correct visa, you'll likely be removed from the country and you could barred from re-entering the UK for up to 10 years.
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My best piece of advice for anything to do with immigration is to go straight to the source: the GOV.
UK website will tell you in plain English what type of visa you'll need and the requirements that go along with it.
If you fail to get the correct paperwork, you are breaking the law and you should expect consequences if you're caught.
Other important websites: You can find more about visa fees here: https://uk/visa-fees Or apply for one here: https://uk/apply-uk-visa In recent years, the UK has made it more difficult for individuals from outside the EU to immigrate to the UK, and public attitudes towards immigration and immigrants in general have become increasingly negative.
First, if you're not a UK or EU citizen, then make sure you get your visa sorted before you leave.