Power flush is likely to find any self sealed leaks in an old system.
If you are keeping an old system with ch header tank - keep it. Do not be persuaded to rework a modern sealed system to prevent on going air ingress and pressure issues. Not worth the gain of 3 cuft of loft space!
Whilst combi systems may give you hot water at an increased pressure make sure that the flow rate at winter temperatures will be adequate for a good shower.
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