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I think that just about sums it up! Thanks for all your help, people. :D

Or maybe not. I've dug up the installation instructions (by some miracle) and they say that the pump must be on the flow side (not the return side). However, it seems that BOTH of the F&E tank lines should be on the flow side too, in the sequence boiler - expansion line (the open ended one)...

Ah! I've spotted where the thread went. One less question!

Er.... no, it's actually frightened me, Mandate! I can't establish which is the supply line and which is the return line without taking the boiler apart - this is probably beyond me! Externally, the two lines are symmetric, both going up before entering via the top of the boiler. Both lines...