How do you get the bonnet open when does not work on a vauxhall vectra?

If the bonnet of your Vauxhall Vectra won't open, first check if the release cable is intact and not broken. You can try pulling the release lever while someone else gently pushes down on the bonnet to relieve pressure. If that doesn't work, you might need to access the latch mechanism through the grille or under the car to manually release it. In some cases, using a pair of pliers to grip the cable may help if it's accessible.