As Simon says above, if there is no contamination (co2) then staying with that report, it says to me that there can not be a leak from combustion into the water ways in the head. Have you looked around the filler cap for a pinkish colour? If there is some there I suggest you purchase a new radiator cap, and then see if you are still losing water. Also, have you checked to see if the radiator core is leaking from age related damage? The garage could be right, but hhmmm.
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Great Barr, Birmingham.
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