I have used a number of sources for the data contained on this website. These include:-
PSV Circle Fleet Histories for Red & White, Jones (Aberbeeg) and Western Welsh/National Welsh.
PSV Circle Bristol RE Chassis list
Official company documentation from my collection, including fleet lists from 1974 and 1976, and a vehicle allocation document dated 6.8.1975. When downloading, please note that the 1976 fleet list is 2.1 Mb.