Confused about sole trader license requirements

Hello, I have some questions about Seller Central that I need answering. Amazon themselves seem impossible to get any answers out of for some reason.

I want to start selling but need the following info first...

Here are my current details:
I have a residency in Ireland but have a UK passport. I have an Irish PPS number and address in Ireland too. I want to use the FBA service on Amazon Seller Central.

My Questions are:
Do I need to obtain a Sole Trader License in order to sell from...

Confused about sole trader license requirements