Thanks guys, I've filled up header tank, packed the stove with wood (on purpose), and realised the sounds = the water boiling because my furthest rad isn't working = airlock. So it boiled over, oh well.
I tried to bleed it but the bleeder screw is broken, probably from last owner so will get a new one.
Now I am keeping the logs + coal going at a good level.
Big thanks for the advice and reassurance. 👍
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