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From the replies it would look like a system clean and a check of the pressure vessel is in order. I'll pick up those details from faqs as suggested. Has been a great help as I was thinking there may have been a design flaw/known problem. Just out of interest are these boilers considered...

Been flushed out with fernox couple of times and inihbitor added over the years. When originally fitted connected to old existing rads and pipework, since replaced. Cleaned afterwards and fernox Water clean when drained last time. In a hard water area though?

I have had worcester bosh highflow for approx 6 yrs - approx every two years I have had to replace the PRV and am on my third autovent. Just about to put third prv on - Is this an indicator of another problem or are these common problems. Pressure always set at 1 Any help appreciated