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Legal requirement under the companies act I thought?
For external email, probably. I can't find the specific text and loads of emails sent by businesses are missing it so it seems fairly ignored[1]. Apparently there are additional requirements in some sectors, eg finance companies have to state they are regulated by someone or other etc. None of this is a logo or ever read.
[1] I've got an email from Amazon telling me something was delivered. No company details.
Email signatures are pointless. It's wishful thinking that your email will be read at all, let alone all the way to the bottom. They often have utter junk like your email address in which is already in the header. It's just bloat, don't have one. If you absolutely must have one don't use tables and 'web safe fonts', colours etc as it is awful for accessibility. Plain text only. Presumably with your phone number or something daft so people you didn't want to call you do.