Oh another one, from my last house this time. It was an 80's house in a row of similar houses. for some reason my garden rose up at the back whereas all my neighbours' were flat. I moved in during December (best time to call the utility companies to change your address by the way is Christmas Eve. You get through straight away!).
Anyway, I digress. Over the winter a hole developed in the slope so one day I went to investigate. I put a fork in the hole and it almost disappeared! Yikes, scary. I'd heard rumours about subsidence in West Swindon but I hadn't realised it was that bad!
I dug about a bit and slowly uncovered an entire shed and a wooden frame of a greenhouse (no glass fortunately). Apparently the previous owners had demolished a shed and a greenhouse and just buried it

Once removed, the garden was as flat as my neighbours'.
I really can't see the logic in burying it. It must have been more effort than taking it down the tip. The hole that developed as the wood rotten and broke down was really dangerous. If I'd had kids I would have been absolutely furious with the previous owners.
Zoe