And was surprised that a few radiators (admittedly the taller ones for bathroom, and cloakroom) had quite a bit of air in - so much that the boiler pressure (which has held steady at 1.5 bar over summer) dropped to below 0.5 and I had to top up the filling loop.
But the heating fired up fine, and no cold spots.
Just wonder where the air came from - the system was flushed and filled with inhibitor last year (10/10/15 to be exact :) )