I need to know if there are any supporting documents that I should provide him.
He is a well-off businessman and will be supporting himself (and his partner) on his stay. He has asked me if I can provide a supporting letter, but having read the latest guidance on the UK gov site I'm not sure if he actually needs this anymore. He hasn't asked me for anything other than a letter, and hasn't made it clear if he will actually stay with me.
I'm a UK citizen and I have my own accommodation here.