Steve, thanks for your post.
Having replaced the O rings on the cap I re-filled the system and ran the the car on fast idle as specified. Straightaway the coolant level rose, and as it did so I syringed out approx 700ml before the fan cut in and I replaced the cap, then switched off the engine.
I will let it cool completely and then re-check the level.
This is not quite as the book but that method has definitely not worked so far and I suspect that the combination of overfilling and the flattened O rings has cost me about £60 in OAT mixture.
Fingers crossed.
I must say I'm very grateful for the moral support this forum gives you in trying to keep these older but well liked MG Rovers going.
Thanks again,
Peter
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