An excellent hardback reference book giving separately a description/ details and black and white photograph of every class taken over by BR at nationalisation, first published in 1961 as 4 separate hardback parts, one each for London & North Eastern, Great Western, Southern and London Midland & Scottish. It was reprinted as one book in 1963 and again in 1965 at 21/- (£1.05), the two issues I have, each containing substantially different photographs. To this day I regret not buying the 4 part edition at a model railway exhibition back in the 1970s.