Now 2008 was a proper winter... just kept falling lower and low from late Nov thro Dec then Jan. Of course if we are into declining solar minimum's we might be in for a right stinker of a winter eventually a la 1962/63.
Just Marmox'd an understairs larder. You would not think 20mm makes a difference but it does on an uninsulated cavity wall. Just need some window reveal beading and remove the old wooden qtr-round. With the door closed instead of the room being painfully cold it was actually comfortable, should solve the condensation on the outer wall I noticed recently. The freezer that lives in there is sufficient to keep the "larder" at a sensible temperature, whilst the insulation will level out some of the summer solar gain.
Not a heating or summer person myself. Bedrooms at 14oC & 3 Tog duvet is fine, cool enough to get to sleep :-)