I understand what a rectifier does, I just don't understand how to implement your recommended rectifier here. It was explained above that the LCRU always outputs either the -DC halfware or the +DC half wave.
I've drawn out the scenario here as I understand. Again, as I stated above, in adding the rectifier, you need to also isolate the bulb socket form the boiler face where as AC common will short out against the opposing half wave rectified DC. I still don't see the need for discrete current limiting with the direct replacement LEDs. Please excuse my crude drawing skills and the inconsistent AC phase on the waveforms.