I was wondering how much it costs to open a company in the UK to do something like that, and it seems to be really cheap (and quick):

a) Incorporate directly via Companies House

The standard registration fee to set up a company is just £12 for the ‘standard’ Companies House web incorporation service, which takes up to 24 hours to turnaround. You can pay via credit card, debit card or PayPal.

Source: https://www.itcontracting.com/how-much-limited-company-cost/