Ha, MrsJack. I have a similar story. Just before we moved to Australia, we were trying to find tenants for our house back in England.
One of the older neighbours (call him R) we lived near applied and had his heart set on renting our 4 bed home despite being a single man and knowing full well he couldn't afford the rent. He came and looked around and we never discussed how much we were renting it out for or anything, so I assumed he was just being nosey.
Anyhow, we find a family to rent the house out to and sign contracts etc, in which time, unbeknown to us, R gives notice on the house he was living in and assumed he was moving into ours. Thankfully we found out quickly so he could speak to his landlord to stop landlord advertising his house.
Anyway, to soften the blow, as R was understandably upset, my husband said "if ya ever fancy a holidy in oz you're always welcome to stay with us blah blah blah". R wasn't well off, has reputation for not paying money he owes etc so never in a million years did we think he'd message us from the airport IN Australia asking for us to pick him up!!
Feeling obligated, because after all my husband offered, we picked him up. He was delighted to tell us he'd be staying for a whole bloody month. The longest month of my life. Although he's a good thirty years older than me, it was like having another child around. He asked me to drop the children off at school and drive him to the barrier reef so he could do some sketches. He got annoyed with me when I said no, because even the southern tip of the barrier reef is a thirteen hour drive each way. He thought I was being awkward not taking him and was in a huff for a few days because I couldn't do that one little thing for him.
He drunk all our beer, ate all our food and never left the house (except on three occasions - which I'll come to shortly) as everything was so far away and it was much hotter in February than he could have imagined! It was the height of our flipping summer.
He came to Australia with $300. That's about 150quid. For a month!!! He probably ate that much in food each week he was with us.
Two of the 3 occasions he went out, he got lost. Was uncontactable and ended up sleeping rough. One of those was the night before his early morning flight. We had to get the police out to find him as they were worried he was attempting to stay in the country (my blood ran cold at the thought). The other time he went out he ended up on an illegal nudest beach and had to accompany a man to hospital who'd got bitten on the @-/$!!!!
Anyway, that final morning when the police finally located him, he was at a local Shopping Centre getting souvineers as his mum had done a bank transfer for him to have some spending money. No offers of any money to us for the food he'd eaten!!! No thank you gift!
We look back and laugh now. Husband has been banned from inviting anyone to stay without running it by me first.