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How do I stop a Gainsborough 8.5 ES from dripping?

I have a Gainsborough ES 8.5 Kilowatt shower which after 2 years has started a constant drip, day and night. I suspect the Hartlepool water (which is filtered - fat lot of use) and its high lime content clogging up something - but what?
I am loathe to jump in and start taking things apart without a little guidance as to where the gunged up article is situated.
Any help would be appreciated.
Alistair Fitchie, April 2008
Obviously I can't then.

Alistair Fitchie, November 2009
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