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Not a combi, unpressurized. Might go unvented in future and they'll pressure test everything then. I may see if I can get the tails out of the old rads and if they are salvageable, reuse them. If not, stump for getting my plumber to just drain the system down and fit new valves. The TRV valve bodies aren't the best anyway.
The rads I took off have metal couplings, was hoping to just be able to get the right sizes of those (and then get someone more competent to replace the valves in future).