marks152 The security code is the 4 digit number on the cars pass card. If you dont have it you can order it from vauxhall but you will need the V5 and 2 forms of ID and part with approx £35 and it is usual available within 48 hours.
Johnss https://z22se.co.uk/attachments/z22se-security-code-recovery-pdf.50469/ 8 quid cable, and you can get it yourself. Got mine same way.. 🙂