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If I understand you correctly - the central heating boiler does not have a small feed tank as it is sealed. So the only job the coldwater tank does is to feed the hot water cylinder AND to provide water to the upstairs cold taps Near enough No.

Problem: The water in the Cold Water Tank is getting hot! I have tried lengthening the overflow pipe from the top of the cylinder, as I suspected that it was too short and resulting in hot water expanding into the cold water tank – made no difference. So while looking inside the coldwater...

Bump +++++++++++ No use doing that, you haven't provided a picture yet. Mod Rupert +++++++++++

I will try and draw a diagram - althought there are pipes everywhere!!! I have turned the temperature down on the bolier, which stops the hot water going into the cold water cistern - thanks for the heads up!! Especially as the tanks are directly above our bed in the loft!! :shock:

A few years ago we had an extra hot water cylinder fitted in the loft, chained with the old one. In theory, I am told, it should draw from both at the same time…? Also I have two cold tanks chained together, each one feeding its own hot water cylinder. But one cold tank is considerably hotter...