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Existing boards are not great. Gaps, uneven in places. Lots of creaks and squeaks too. Huge amounts in fact. We had engineered wood over original Edwardian boards in our old house. Over time squeaks and unevenness increased. This may of course have been due to a poor job.
Suggestion for the new place has been to take the existing boards up totally and replace with ply. I do wonder whether I could get away with just new boards with no engineered wood over top .
Are the existing boards reasonably flat (no massive peaks/troughs)? Because if so cork underlay + engineered wood would probably work. If massive peaks and troughs, I would probably rectify that by replacing individual boards/shimming/trimming, rather than trying to fix it by adding more stuff on top.
We are going to go for the above (levelling the subfloor by replacing boards) + cork + bamboo.