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Hello, and thank you for your question.

You will need to register as self-employed and obtain a Unique Taxpayer Reference.

I have attached a link to the page on our website which advises what you need to do.

https://www.gov.uk/working-for-yourself

Here is a link to an alphabetical list of different licences which are required for various trades.

https://www.gov.uk/browse/business/licences

In relation to what proof the National Insurance office need, you would need to ask them what they require.

Hope this helps.