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Some very interesting comments, thanks for good wishes and concern.
I am neither elderly nor vulnerable and my wife is also very capable and level headed.
I have not turned my house in to a 'doss house'. If my neighbour hadn't seen him leaving the garage early one morning she would have been none the wiser.
I don't think anyone would choose to sleep in my garage if they had a better offer - it is unheated, has a concrete floor, no window and is used to store my washing machine, tumble drier, two large freezers and other household goods.
Although he is able to get out of the garage he can't get in unless I or my wife unlocks the garage door. He can't get in to the house from the garage as he doesn't have the key to a very heavy fire door.
I have never seen him drunk or under the influence of drugs - that doesn't mean he never uses them, though. I really don't know.
He occasionally accepts a bowl of porridge in the morning or soup at night, never asks for it.
We are not being 'good' - he doesn't put us out in any way.
We had seen him begging at the supermarket a few times and he helped my wife out by changing her wheel when her car had a puncture. Simple as that. Next time we saw him it was bitterly cold so I offered him use of my sofa but he refused, he did agree to shelter in the garage.