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Thanks for all the advice. In the end, when I went back to look at the original pump and it's replacement, I discovered the replacement is about 6cm shorter. Didn't feel there was enough give in the pipes to make the shortfall so decided to drain the system anyway. After that just removed...

Running into difficulties removing a CH pump. Have attempted removal by closing isolator valves and undoing union nuts with wrenches (one man on each wrench) with no success, also attempted lubricating oil on union nuts but they appear to be seized. Planning on using a heat gun on union nuts...