How do you order a new key for your 97 astra 1.7td van?

take it to vauxhall or get them to come out to you as the key is chipped you'll probably need v5 and proof if that's to expensive find same model in a scrap yard or ring around and and get ecu, ignition barrel with key along with black key code box next to barrel. simply swap them all over with the ones in your car, easy to do