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Yes you will have to find where the pipes enter the concrete. The pipes could be boxed in or in a cupboard, hopefully they are not buried in a wall. I like the idea suggested by Jon, isolating the F&R to the cylinder, it's definitely worth a try.

How many radiators are fed from pipe work buried in the concrete floor? Can you see a flow and return going into the concrete floor, possibly 22mm pipe? Just wondering if the pipe work feeding the pipe work buried in the concrete can be isolated separately to the rest of the heating system. I...