Part-built 3 1/2 inch gauge "Britannia"

A part-built 3 1/2 inch gauge "Britannia" to LBSC's popular design. Work to date comprises a largely complete chassis, gunmetal piston valve cylinders with Walschaert's gear which looks to be at air-running stage, together with a largely brazed and silver soldered combustion chamber boiler, with calked stays.