As long as your DPC s sound it will be fine. I would advise doing the floor with the Cellarcote before screeding! Trust me this stuff is the mutts nuts! Just follow the instructions carefully and good luck!
What part of London are you in I could recommend a couple of suppliers, bare in mind it will take a few days to get in as it's not something heybwould have lying around!
I am based in Barking, close to East Ham, or Ilford, the cellar floor is extremely dry, and very dusty, we had to splash water to calm the dust down and wear dust mask, totally dry floor, problem is the builder is starting to screed tomorrow, he came in today between 9pm and 11.30pm and made preparations, cleared all my stuff away from half of the cellar over to the other side and prepared the surface ready for screed.
Earlier today i ordered a ton of sharp sand and 6 bags of cement, we will get some more cement as we need, going do at least 4:1 sand/cement screed, apart from the usual preparation of the surface like applying the pva/bonding to ensure the screed stricks to the pebbles and concrete, all should be well as far as dampf proofing at the floor level is concerned, If the cellar had a decent bit of height, i would have gone for insulation as well, but that won't be possible now as already the cellar height is restricted and just touches my head! and I therefore can't affoard to bring the floor up too high, 2" screed at heighest point to about 3 to 3and half inches at the lowest point, the floor is very uneven. We could have gone down to get some decent standing height by digging up down, but then it gets too much for what we are going to use it for and it could weaken the foundations.
Please let me know where I can get that stuff from around east london. thanks
edited:
just googled Sealocrete, and got some very good information about the product, thanks for your reccomendation mate, sounds the only stuff that can resist damp froma 100meter head of water! wow! I hope it is not too expensive! I am definitely going for this and 1 litre covers 3-4m sq.
http://www.sealocrete.com/product_260_16