I reckon the above are a valid points, and maybe there is a way to correct the issue. Yet, I regret not having considered coverting to a concrete floor in the first place...as this is a terrace house and it is difficult to keep ventilated.
I am considering doing a floating concrete floor (not sure if the terminology is correct). In this way the services run just under the floorboards and over the concrete.
what's the best option?
repairing a suspended floor? or converting it into a concrete floor?