CPS03. An unusual model of BR Derby Laboratory Research Coach No. 14. ‘Wren’. Departmental number RDB975427, and in BR Research Dept. colours. This was an acoustics test vehicle converted from a Metropolitan Cammell Pullman car Kitchen First ‘Wren’ (built 1960 as M325) in 1975. This is from a D.Parkins (Post-war Prototypes) metal kit with Cavalier Bogies and steel wheels. The prototype was a stripped shell in Vic Berry’s scrapyard by 1989 and had gone by 1991. £195.