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Thanks for all your replies. The new build lash-up would sound right given the build quality of the rest of the house (Croudace = s**t, IMO). Anyway, following ChrisR's suggestion, I went into the loft to see if anything came out of the vent pipe when the system started pumping. Guess...

My central heating system was installed in our brand new house 5 years ago. I have a Suprima 50 boiler (already encountered the lockout/pcb problems) running the hot water and 12 radiators in the house. After about a year, I was getting severe boiler kettling and lots of bubbling...