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The heating works well even though it seems to have a mixture of 2 pipe and 1 pipe runs. I think the fact that all but 1 rad have TRVs helps self-balancing.

Yes I agree. Leaving as it is.

OK that explains it. So to answer my own question, if I change it as proposed, I risk shutting off the feed to other radiators on this pipe (if there are any) if both living room radiators are off. A bit more investigation required, because there are radiators elsewhere in the house with 2 pipe...

Hello, After living in my 1970s house for 6 years I decided to move one of the radiators in the living room and add a feed out to the conservatory for future connection. I was surprised to find that both radiators have both ends connected to the same pipe (see Fig 1 in the diagram). Never seen...