Ok,so ive been out to the car this morning to have a play with the switch.Had it all out the dash,the bulb seems to be a resistor type bulb,so will need to source a new one of these and a solder iron to replace this.As regards to hearing any relays clicking when turning the heated seats on,i can hear it click on the passenger side seat when turning on at the right hand side of the control switch and a click from which sounds like from behind the dash when turning on at the left hand side of the control switch.