I assume you have looked around the area where he opened the key to try and find the chip..
Lots of mobile technicians, independent garages offering diagnostic testing, and even some key cutting shops, have the diagnostic equipment required to pair a new immo chip to your car, just look through yellow pages etc.
It would be worth phoning the Vauxhall for a price, they might even be able to send someone to you to fit it, it's just done with a laptop or hand-held device.
Another option would be to join
www.vauxhallownersnetwork.co.uk
www.vvoc.com
Many of the members have diagnostics such as Op-Com, and will do the job for a few pounds at most, sometimes just for coffe and choccy biccies!
vectravic, October 2010