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It's under regs and going to be inspected by a privately hired company. There was no hardcore under the original slab. Hardcore going below the insulation100mm, dpc and 150mm concrete and 50mm blinding(not in that order). Thanks for the reply. Bit more confident moving forward with a thinner...

My drawings use the term 'well consolidated hardcore' without specifying the depth. The ground is good having already had a slab removed. So I really only need to bring the level up to meet the existing floor. This means the 'WCH' will only be around 50-60mm. Is this ok?