How do I fill out a W-8BEN-E form UK?

The W-8BEN-E is an IRS mandated form to collect correct Nonresident Alien (NRA) taxpayer information for entities for reporting purposes and to document their status for tax reporting purpose .

No not necessarily . Only where a foreign corporation is engaged in a trade or business in the US that generates effectively connected income (ECI) with the conduct of that trade or business. They would file Form 1120-F if they had a trade or business at any time during the taxable year.5 Eki 2019

It has most of the required fields, but they are quite easy to fill in.

Who Must Provide Form W-8BEN-E. You must give Form W-8BEN-E to the withholding agent or payer if you are a foreign entity receiving a withholdable payment from a withholding agent, receiving a payment subject to chapter 3 withholding, or if you are an entity maintaining an account with an FFI requesting this form.