You have a website. Yay!
You have a company. Or you’re a sole trader. Or maybe a partnership. Yay!
But what company information do you need to show on your website? Legally, that is.
If you’re a sole trader or a partnership you need to show the address of your main place of business.
If you’re a limited company you need to show your company number and place of registration (for example England and Wales), the official company name (including the word Limited to show the company status) and your registered address.
Taken from: http://www.ukwda.org/blog/is-your-website-legal