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On both rads the flow pipe (is this the end with the lockshield valve?) is warm but the return pipe is cold. What does this suggest?

Plumber did get the new rads working for a bit, but they go cold again after a day or so.

Have looked for a similar problem on this site but cannot find, so apologies if dealt with elsewhere! Moved into new house - built 1960s. CH system (combi boiler only year and a half old) has big old rads and big steel pipes. 2 extensions were built last year by previous owner and these 2...