Outside my house on the road for about two hours now there has been a naked old man who I don't know, just standing there in the rain and shuffling about. It wasn't really my business so I just left him there, but now there's somebody knocking feebly on my door downstairs every ten minutes or so and I'm pretty sure it's him. I don't want to let him in because basically it's my house and he shouldn't even be in my garden in the first place, so I'm pretending I'm out... is there anything else I should do? I'm really not prepared for this kind of situation.