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Fair enough - my question is that I can't remember which exchanger he was talking about replacing. If it is the central heating that is suffering with sludge, I assumed it must be the central heating exchanger that was blocked and acting up, which was having a knock on for the hot water. But...

Yes - heating working fine. Bled the radiators recently and everything seems fine.

Thanks Tony - I'll try that. What am I looking for?

Yes - it affects all the hot water. Just more noticeable in the shower.

I have an issue whereby when in the shower, the hot water varies in temperature. Every few minutes the heat drops for a minute or so and then comes back. Just had the boiler serviced and the engineer said that the issue was sludge in the heating system. This was causing a blocking in the heat...