Alvis Stalwart FV 622 or "Stolly".

The Vehicle that started the NLBA off, The photo is of its first outing to Southend back in 1995.

Technical specifications
Length: 6.356m
Width: 2.616m
Height: 2.312m
Kerb weight: 9,000kg
Gross weight: 14,000kg
Fuel capacity & range: 450l / 820km
Engine: Rolls Royce straight eight 6.5L petrol
Capacity: 6516cc
Max. power: 220hp @ 4000 rpm
Max. torque: 335 lb.ft @ 2500 rpm
Crew: three
Amphibous