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there should be a drain cock at or about the lowest level, perhaps on a radiator near the back door (where it is easy to throw a hose outside)
we are looking at evidence to see if the system is being topped up from the tank. What you are describing often happens if there is a blockage.
It is usually just below that brass joint that you losened, you could try taking it off and poking a stiff bit of wire down. Or hold a strong magnet against the copper pipe and see if it is attracted (this happens if the pipe is clogged with black iron oxide)
hi
i shall try this tomorrow if i can,
thanks