Bled my coolant system again. This time tried to get the expansion tank off to raise it as far as it would go on the pipes but the bolt holding it on is well and truly seized so I filled the header tank to the brim and squeezed the top hose repeatedly, lots of bubbles appeared. When they stopped I emptied out the header tank to the right level using an anti-freeze tester. Hopefully all the air is out now but I'll monitor it over the coming week.
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