Whilst replacing an old DB I found that an outside light had been wired in and doubled up at the MCB, foolishly I had counted the the old fuses without taking the cover off, the new DB I had bought allowed for no more expansion can I double up at the MCB with this extra light, rings circuits I know is a no goer for an additional socket to be added due to the rating of the MCB (32a) but can I double up on a lighting circuit.