Like fingers plucking at strings, or air blown across the top of a bottle.

We knew we had bought cheap windows. But I didn’t expect the moan when the wind was in certain directions.

First the front window started to ululate gloomily, a long rising note, not too high pitched. Only when we have a northerly wind does it start up with a tune.

Then we noticed one of the kitchen windows joined in with its own moan. This does not happen when the trees are covered in leaves. But when the shelter blows away as autumn progresses the light moaning starts to return, gradually deepening as a storm intensifies.

You really couldn’t get more excellent moans. Just add the motor from the fridge making puppy dog whines as it starts spinning up and you have a whole set of spooky sound effects even when you least expect them.