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Appreciate all the help given by you guys - it makes a difference. I bought a new flow switch from MJT (good suppliers - I asked a question on their website and got a phone call in reply. Ordered on the web and got it within two days - that's what I call service for a £17 ex VAT part)...

The boiler stopped firing so I followed the flowchart in the manual which pointed at the two flow switches. I noticed that scale was emerging from the left hand one and it was dripping slightly. I unscrewed it (they're hand-tight), cleaned and replaced it - sorted the problem for a few weeks...