Regardless of any other consideration, the following activities require a minimum of two operatives on site — lone working is prohibited: (1) Confined-space entry (per SOP 8.12) — one operative entering, one in attendance with rescue capability; (2) Work at height above 2 m (per SOP 8.11) where the controls require a banks-person, second-pair-of-eyes, or rescue plan; (3) Excavation deeper than 1.2 m (per Method Statement 2.9 and the RA-01 family) — collapse rescue requires a second operative; (4) Live-traffic work in the highway (per Chapter 8 and Method Statement 3.3.2) — banks-person required; (5) Any work on or with asbestos-containing materials (per SOP 8.14); (6) Pressure-testing of mains at pressures above mains operating pressure (per Method Statement 3.11.1); (7) Work involving live electrical systems beyond simple fused-spur isolation; (8) Lifting operations using lifting accessories (slinger / signaller required by LOLER). For all other lone-work tasks, the check-in protocol applies. Mobile / out-of-yard lone working (e.g. driving between sites, single operative on a quick-fix task, surveying alone) follows the standard check-in flow above. Remote / weather-affected lone working requires additional controls: weather check before start, GPS-tracked vehicle, lone-worker app or buddy call-in every 60 minutes minimum.