Further information

"The South Downs Way National Trail Guide" by Paul Millmore. Aurum Press.
"The South Downs Way Accommodation Guide" is available to order, 01903 741234.
"Along the South Downs Way" by Harry Comber, Society of Sussex Downsmen, 01903 771906.
"The Landscape of the South Downs" by SDBC and The Countryside Agency.
"Sussex" by Peter Brandon. Hodder and Stoughton.
"The South Downs" by Peter Brandon. Phillimore.
"Horse Box Parking Guide" from the Sussex Downs Conservation Board, 01903 741234.

The Ordnance Survey 1:25,000 Explorer Series covers the whole of the Sussex Downs. These replace the old Pathfinder Series, and have more detail than the Landranger Series.
The sheets for the South Downs are:

132 - Winchester, Alresford and East Meon
120 - Chichester
121 - Arundel and Pulborough
122 - South Downs Way (Steyning to Newhaven)
123 - South Downs Way (Newhaven to Eastbourne)

Harvey Maps have produced a single map of the entire route of the South Downs Way. This is also translated into French and German, and is on waterproof paper. It is available from good outdoor shops.