"But wouldn't you expect a dodgy PCV firstly to have first made a noticeable change and then get increasingly worse....?
It dawned on me that oil consumption had increased dramatically - and it was getting worse. There was no obvious smoke....... if fact, no symptoms (to me) other than oil disappearance.
I don't profess to be an expert on the matter - it's just that the Focus had started to use a lot of oil - and this proved to be the answer. I'd never heard of the wretched pcv valve before but, when I looked for information, some seemed to feel that it should be changed as a routine service item.
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