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That is what I worked out in the end, a numatic george and over an hour!
The flat has been converted to a combi boiler from a floor mounted boiler and tank or tanks. Not sure if these did the tap water too. There are also two previous gas meter locations with assorted pipe work. That I will remove all the above concrete pipework by filling with water and cutting.
The system does (hopefully did) seem to have a lot of dark metallic flakes that a power clean and replacement radiators did not fully remove. Oh well the leak is gone and the system is holding fine.
What was interesting, when the system was drained I pumped the pressure vessel up to 1 bar on my track pump guage. It did take quite a few pumps, which initially led me to conclude that the pressure vessel membrane had failed, to get a reading of any pressure. I did double check the pump guage with a digital one. The readings agreed.
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lynx
@Airhead
Seen it done using a water vac to suck the last bits of water out of the system at the point you want to repair. So cut at the repair spot, start sucking up the water, keep sucking it up till it's dry, dry the area and pipe with the flame thrower, make your repair. Alternatively use a repair sleeve with compression joints, bit dodgy under cement though.