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Okay thanks for clarifying that. I've looked at how to replace the AAV in the boiler instructions, it's very simple step one unscrew AAV, step 2 screw in AAV. Fitting is reverse of removal, funnily enough. :) I'll be draining the system over the next few weeks to fit a new radiator...

I've got a Worcester 24i System boiler something doesn't seem right from what I can tell when the boiler comes on to heat the hot water cylinder the CH RETURN pipe gets scalding hot, as well as the CH & Cylinder FLOW pipe. The piping from the CH FLOW goes from the boiler down to the cylinder...