He looked over the machine and said it looks in good nick. It was pristine. He the .asked me for my best price to which I just smiled back. He then said would £80 do and I agreed just to get rid of it and then he handed the cash over.
I then let them take it away. But I was carrying the inlet pipe on it's own and watched them struggle from maybe 2-3 feet away. As soon as they moved it 2 metres they put it down in the snow. Then struggled to move a few metres before putting it down again and again. He then got tired and told his mate to go get the car and bring it closer. Whilst his mate brought the car he pushed it in the snow a few feet.
They lifted it into the car and I then showed them all the snow inside it and then placed the pipe beside it.
Don't let them in your house or use the facilities keep them outside.
Demo it working.
And plumbing...This is of course assuming you have a plug socket in your front garden...
I had this trying to sell a table and 4 chairs for £50 with good pictures and dimensions. "can I take a look?" etc... No you can come round to buy or you can look at photosI've had various Gumtree buyers try to haggle in my house after having already agreed a price or pretend to be a tenner short. 'We agreed £X' followed by a few seconds of silence will make them cough up.

The police won't be much help if he decides to rock up one night and put a brick through my window or my car's, etc. They would want evidence of which there would be none.
So it's a lot more complicated than just call the police. As for handling it myself there is a good chance that would end up with me in jail, jobless then homeless. So again not exactly something I would like to do. But I imagine all the keyboard warrior's on here always take that stance on the internet, in real life not so much.