This is not a joke, in the UK, there really is a "Bank of Dave"

This is the dramatised film, but it is a true story:
https://www.netflix.com/gb/title/81518575

This is the Bank (which is not allowed to be called a bank):
https://www.burnleysavingsandloans.co.uk/

This is the documentary made about him:
https://www.youtube.com/watch?v=0fIGZOe-Oa0