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So again, if I accept that there is some F&E tank water entering my system at least some of the time (ie when the u/stairs rads are on as well as d/stairs) then why is my system in such a clean condition after > 40 years?. I installed a bigger hall rad ~ 10 years ago and the 30 year old one had no sludge in it, only slight discolouration of the water in the bottom.
If you read siricosm article link then it suggests it takes roughly 75 days for the oxygen saturated water content to dissolve the oxygen, perhaps your layout is helping things? Have you been regularly dosing your system to protect it? I imagine someone as well informed as you has done a lot to maintain the system quality.