All position lights are on with ignition on 3.7 Roadsters. Total current drain 20 watts with OE filament bulbs. With your LED setup Andy, even including optional wing light's the total current drain will be significantly less.
Good to hear no MOT issues. The DRL ruling seems a grey area when the after market "DRL" is integrated with headlights and is essentially the position light as well. A stand alone dedicated one would cause more concern I suspect if it didn't conform.