That photo didn't do my vertigo any good at all, Canary! Weren't the people in the house lucky? A word with the surveyor they used before they bought the house would be in order, I think.
One of my irrational fears is that I will fall donw a sinkhole/ mine head in my garding
and yes I have only bought a house where I know there is no mining
Mind you readers - the hole in cornwall is 300 ft deep !
What I think you will find readers - is that the concrete cap 6 to 20 ft wide has gone fwoop ! . It is OK if the top is V or funnel shaped
but here it wasnt
they put in a wooden roof strutty thing and laid the concrete on top but that rotted and the plug fell in