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My Amazing 25-Year Journey with Brighton & Hove Buses, very numerous photo illustrations (mostly in colour, a few historic photos in b&w), coloured route-maps, 160 pp, sewn paperback, slight scratches on front cover, otherwise in very good condition with uncreased spine, For Classic Bus magazine by Best Impressions 2010
21 x 25.8 cm, 860g, ISBN 978 0 95657 400 8
It seems the abbreviation D.L. stands for Deputy to the Lord Lieutenant of East Sussex. As there may be up to 49 Deputy Lieutenants (the exact number depends on the population of the county) the honour is not quite in the same category as an O.B.E.
See the description from the Classic Bus magazine website.
The book was only ever published in paperback, and is now out of print.