There are some pages your website must have, and in the UK, there are some items that must appear somewhere.
The pages you must have:

Must include methods of contacting you or one of your staff, including email, mail and telephone. (these can be coded so they cannot be harvested by automated programs)

Must say something about your company
This must spell out how you handle privacy of visitors, including storage and use of email addresses (Thjis can be art the bottom of your Contact Us page, but must have a link in the navigation bar)

There should be two or more of these pages, the more the better

Full Company Name (eg, Smiths Industrial Equiment Ltd) There are some differences in the requirements for public and private companies, and you need to check this at Companies House.
Where the company is registered
The Company Registration Number
Address of the Registered Office
Business Address
The VAT Number (if you have one)
If your business is a sole trader or partnership, this may need to be shown, and you need to check this at Companies House
Not obligatory, but to get a good ranking in the search engines, you need some extra pages of general interest about your business sector, or products or services.