Hello hope someone can help me. Have just changed all my rad valves with TRVs. I have left the rad with the room stat with 2x lockshield valves. I have adjusted the lockshield valves of all the rads with new TRVs according to their piperun from the boiler. My question is regarding the rad with 2x lockshields (in room with room stat). Should these be left fully open?, or the flow open and the return side balanced in with the others, or both fully open - bit confused - please help