What do we do?
I asked our builders to lift a couple of sunken slabs in the garden and they've found some corrugated metal sides, filled in with stuff but also with gaps. Bit early to say yet! Building inspector has been today and isn't concerned as it doesn't affect our extension and foundations. He said we can do what we like with it!
DH is getting over excited at the possibility of digging it out and creating a man cave! --where I can lock him in if he is winding me up-/
Anyone know much about them?