Mary Fisher wrote:
My neighbour and I are agreed that our flats are significantly colder when
the flat downstairs is unoccupied. We benefit from their heat.
Of course you do. But the lower neighbours would also benefit from your
insulation.

Yes, but I get their heat and they get my floorboard squeaks. Fair
exchange is no robbery!

Now, if I could find their electric cables ... :-)

Owain