In the preparation of these data pages, I would like to acknowledge the following sources of information and graphics.   Eric Scott.

David Ballantine
Michael Drake
Dick Gilbert
Peter Relf
A History of London Transport Volume 2 - T.C.Barker and Michael Robbins
Ian Allan ABC of London Transport 1948, 1949, 1950, 1952,
Ian Allan ABC British Bus Fleets #12, London Transport 1963
PSV Circle and the Omnibus Society Registration Lists - Publications LTR1 - 4
PSV Circle Leyland chassis list for London RTLs & RTWs, CXB163