Ah thank you guys. The not so expensive cost aspect of this is reassuring.
if I was physically capable of flushing the system myself I would, but that is not something I can do.
Services in early September from now on! Really appreciate all of the feedback
So I have bled all the rads and topped up to 1.2 (thanks Prenticeboyderry). Turned on heating and within 15 mins pressure rose to 2.9 (ARGH!).
Went round an felt all the rads and whilst a few were piping hot, some were cold on bottom and hot on top and the rad in the front room is still cold...
Cheers - the system was cool when filled to 1.4. It will normally rise to 1.8 /2.0 max. 3.1 was a nightmare. Will try an overnight switch off of the system, bleed rads get the pressure to 1.2 and then give it another go.
had this boiler for a while and become a pro at both filling the pressure and releasing pressure over the years (mostly thanks to this site )
So my latest woe is:
Last week turned on heating, checked pressure all fine. Switched to timer for some morning heat, but nothing happened. Checked...