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i know it sounds daft and am told this is the normal process but since I replaced my cold water storage tank float valve In the loft I have noticed that after a relatively short use of hot water (say a short 2 minute shower or filling the sink with hot water) I hear the water what I assume is filling my hot water tank in the airing cupboard. It does stop and there seems to be leaks or overflowing. The thing is before I replaced the float valve I would never hear this unless I used a lot of hot water. Say having a bath or multiple showers.

Any ideas why this might be?

That should say there isn't any leaks or overflowing.

Hi Longroad77

Any use of water will lower the level, allowing the valve to start replacing the loss. Your old valve must have been very quiet, or was sticking in the closed position.