The boiler had a clean bill of health, and was back doing it's thing this chilly morning.
Flow temperature is set at 57C (unless outside temperature goes below 0C, then I'll whack it up to 60C) for those that are interested; I have a solar diverter on the immersion heater so I have no concerns...
It been cold enough overnight for our central heating to fire briefly two mornings on the trot now, and the solar panels have barely fed anything back to the grid in several days.
Just got back from Cornwall to find that the South East is considerably colder than the South West, so the central heating has turned itself on.
I knew the weather couldn't have been great as the solar panels have generated sweet f.a. today.