Not sure if there is already a write up for this but its not really hard to do anyway.

Order 2 parts from vauxhall

1) The switch





2) The pipe ( check to see if you have got this first or not as most olders cars do have it)





Ok now remove the glovebox by removing the 4 Torx screws as shown



And give the glovebox a good pull to get it out, remove the clip for the light and it will come out completely.



The pipe needs to be fitted on the right hand side nearest the centre console, you need to remove this little bung.



Then fit the pipe as shown below



Put the glovebox back in remembering to connect the light up again, then its just a matter of pushing the switch in on the glovebox.



Very simple mod but will more than likely come in usefull.