i have been replacing the bulbs in the ash tray and the headlight switches as they were all blown and i thought i would share how i did it for those who are interested.
the bulb holders look like this once removed
the bulb and the contacts can be removed from the holder by using a flat head micro screw driver and lifting the barbed bit that holds the contacts in place
then push the contact out with the bulb
break the contacts free from the bulb as you will need them and dispose of the bulb
then solder some new bulbs (available from maplins http://www.maplin.co.uk/p/12v-096w-wire ... type-wq13p
) onto the contacts
then reinsert the bulb and contacts back into the plastic bulb holder and push the barbs back down so they cant be pulled back out.
test the new unit with a 9v battery just to make sure it works then put it back in the car
would be nice to try some leds instead which i might do at some point.