I put LED bulbs in my S1 side lights. They passed the MOT and as I understand it are legal. As the PCB was failing again I wired the lights to be permanently on side lights (thus not DRL) & that passes the MOT as 3.7l Roadsters are wired that way.
I also changed the headlights to have 1/2 ring of LEDs in them.
None of that stopped a white van T boning the car in broad dayligth on a straight road.