There’s eBay Vauxhall Key Matching Service (take/upload a photo), also a Vauxhall dealership should be able to identify the pattern? Should be cheap enough.
They’re the work of the devil in any case and have the unnerving knack of seizing when you need to remove them most.
Go to any decent independent tyre shop (and probably not outfits like Kwikfit) and they’ll have them off quick enough. Once off, replace with ordinary wheel bolts.
