For reasons that you are already aware, anyone hired for a security services position needs to comply with a robust vetting process. The hiring authorities at G4S must be very cautious on who they hire; for the safety of themselves, their clients, and the general public.
As a security professional, you will be working with the public and with vulnerable individuals. Assure the interviewer that you are most willing to comply with any form of background check they require. If possible, bring a copy of a recent police background check with you to your interview. Although this action will not be everything the interviewer needs for your file, this will show initiative.
