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Once the floor has come up, a waterproof membrane and a load of readymix is fairly easy to deal with.
Don't forget to stick some insulation down. Your architect should be specifying this to make sure it complies with Part L1b of the building regs.
You'll also need to find somewhere in the flat to hide the manifold and pump set for the UFH.
Prole.
It is quite a job, but the rats are a real headache. I live in a lovely victorian cobbled street, which has a lovely victorian sewer running down the middle of the road. It's a perfect place for the little buggers to breed and they come up somewhere in the street every summer. As long as there is a void under my floors, there will always be a risk of another infestation. As things stand, most of the floor will need to come up in any case, to find their entry point and possibly line the entire void with wire mesh, and also to rip out the 1960's central heating and the lead pipework which still supplies my mains water.
Once the floor has come up, a waterproof membrane and a load of readymix is fairly easy to deal with.