A whole load of banking products aren't legal in the UK, or are highly regulated; particularly sludge products which are easy to sign up for but hard to cancel.
UK banks are required to make their communications easy to understand and relevant. There are also regulations requiring banks to tell users when products may be unsuitable.
All UK companies have to adhere to the UK GDPR, which allows users to restrict what marketing can reach them.
For my four personal accounts my last email was last October, and the one before that was last July.
For my business accounts I have most set to email me a statement every month (automations attached).