UK SET UP UK LIMITED COMPANY

[ACS]

Hi! I hope you can help answer this. Here's the scenario, I would like to set up a limited company in the UK (lets call it company b), with the sole purpose of investing excess profits into stocks and shares from another company, that I own (let's call this company a). My question is what is the most accurate and the best industry SIC code to use - which banks would be comfortable with for opening a business bank account? and also which uk bank is most likely to allow me to open a business account for company b? Thank you for helping!