Rung 1 to 2: Static to Supervisor
The move happens when you're seen managing your own paperwork, mentoring newer guards and running incidents without escalating trivial calls. Ask for supervisor duties on quiet shifts before you ask for the title.
Rung 2 to 3: Supervisor to Contract Manager
ILM Level 3 in Team Leading or IOSH Managing Safely are the standard stepping-stone quals. Get one; put it on the CV. Volunteer to run a small event or one-week temporary contract.
Rung 3 to 4: Contract Manager to Operations Manager
You need to show P&L: won contracts, retained clients, kept margin. Learn to read a monthly management account.
Rung 4 to 5: Head of Security
Client-side (in-house at a corporate) rather than supplier-side is the higher-paying route. Security Institute (SyI) membership and the CPP or CSMP qualifications are common signals.