Would think that a SJAB ever going airside without an escort is extremely unlikely.
At the BAA airport I occasionally get called to (999 ambo calls) we never go near the airside area without the police, who stay with us until we are landside again.
Also I reckon those orange lights might be halogens as that lightbar appears to be manufactured by the same people that make ours and we have blue and red halogens sited where the orange is on the SJAB vehicle.