You need a Level 3 qualification to work as a Security Supervisor.
Level 3 requiredRegulated occupation
Your route in
Qualification REQUIRED to practise (regulated) - minimum L2
1
The qualification you need (Level 3)
Below this level you cannot practise; these get you there.
2
Where this can take you
SIA front line licence (Level 2 licence-linked award) is required to work in contract security; the Security First Line Manager Level 3 apprenticeship is the recognised supervisor step.