 "Biter" is part of the First Patrol Boat Squadron (1PBS) based at HMNB Portsmouth.During overhaul, two Cat C18 ACERT propulsion engines were installed by Finning Power Systems.The two diesel engines, each rated at 873 bhp at 2200 rpm, form part of the propulsion package along with ZF 2000 RV marine reverse reduction gearboxes and ZF 9000 Series ClearCommand controls.