If you want a job in security industry, you will need to get a SIA (Security Industry Authority) licence.
–Manned guarding, which includes:
-Cash and Valuables in Transit
-Close Protection
-Door Supervision
-Public Space Surveillance (CCTV)
-Security Guard
–Immobilisation, restriction and removal of vehicles
–Key Holding
Here is the link where you can download SIA application form or fill your request online.