Mary Fisher wrote:
Avoid semis/terraced properties. When you've lived in a detached, even
when the gap is only a metre or so, you'll never go back (until you're
gaga)
As long as you can afford the heating without someone else's insulation.

My neighbour and I are agreed that our flats are significantly colder
when the flat downstairs is unoccupied. We benefit from their heat.

Owain