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Thanks, I will check that and post back.

I have a Vitodens 222F boiler and it leaks from the PRV, not all the time, but only when the boiler is firing. My first attempt to fix this was to replace the PRV, which I have done twice now. This has not helped. I have also tested the PRVs that I removed and they don't leak when connected...

Thanks for your response. I tried with a 115mm angle grinder and it can only cut a couple of cm depth so I felt that it was going to take forever. Then I contacted a concrete cutting company and they quoted £1200+VAT to do the work. Perhaps the best thing to do is to rent a bigger angle grinder.

I have lowered my slab by around 500mm and this has meant that the foundations are now slightly above the top of the slab by about 50mm around the doorways. The plan is to put 50mm insulation and then 50mm of screed on top of the slab. Is it preferable to cut or grind the foundation concrete...