It depends I know that old school telcos use security Vetting for people with wide access to systems and this is DV Developed Vetting or TS (in American usage)

It depends I know that old school telcos use security Vetting for people with wide access to systems and this is DV Developed Vetting or TS (in American usage) And our Internal security team (BT Security) was bad news if you where investigated - they have a ferocious reputation