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I had already ordered some Fernox restorer and protector before your reply, so I will try this first especially as its a lot cheaper, it hopefully should be ok as system a couple of years old, will try power flushing as a last resort. I will probably have a go on the weekend, the noise has...

I couldn't see anything obvious to drain the boiler, apart from a couple of spring circlip type things near the pressure relief valve, it looks these allow quick removal of the valve, I will have a closer look when I have got the fernox restorer and protector, I might drain the whole system...

In case you are confused by the reply from a different sender, I replied from another computer, hence another log in name. :?

Since restarting my central heating I have have noticed a sound, which sounds like knocking, also a kettling noise, these noises only appear as the boiler warms up :( , and will disappear when the correct temp is maintained. The make is a Worcester Bosch 24i sealed system combi, and is is...