If you have broken the circuit you will need to reconnect it.
This could be either in a new shaver light unit, or another light fitting (to at least IPX4 if it is in zone 1 or 2 as per reg 701.512.2), or if outside the zones (at least 0.6m horizontally from the outside edge of the bath or shower tray) you could fit a fastfix box, connect the wires in connector block and cover with a blanking plate.
Adam, April 2010