On Tue, 29 Nov 2016 22:22:00 +0000, John Rumm wrote:

Yup, there is a lot to be said for gaining access via ceilings
rather than via floors - often cheaper and easier to fix.

Unfortunately here in Cumbria anything in the roof is liable to
freeze during a severe cold spell. That's why I moved to a
pressurised system in the first place.