Why are you using the clipped direct figures when the existing cables are buried in plaster and I assume your new cables will also be buried in plaster. For 4mm² T&E buried in plaster you are looking at 26 - 27A so your lolipop fails at the start as I doubt it is all clipped direct allowing you the 37A you quote. The reference methods are there for a reason and you can't just pick the figures that suit your needsThis I don't understand. Using Table 4D5 clipped direct 4mm has capacity for 37A, 2.5mm has 27A (so using a ring 54A). Both well within the breaker capacity of 32A. So why would my option not be viable?
Unless you have followed the route of the existing cabling it is likely that the skts are not in order on the ring through each room also adding skts as you go would more than likely cause more issues than it solves
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