Thanks folks that's a great help. So, even though the outlets aren't lockshield valves, once I identify which are outlets, should I try to balance them so they don't take too much hot from the rads further away from the boiler (like the typical balancing routine)? It all seems a bit...
I have a house full of traditional style radiators but valves on either side are normal valves (not TRv). How do I know which is inlet and which is lockshield? Should I assume the inlet is always the same side as the bleed valve? Thanks in advance..