Cicerone - Guide de randonnées à vélo (en anglais) - Bikepacking - South-east Gravel (Cantii way and 11 long-weekend bikepacking adventures)

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Guidebook to 12 of the best gravel bikepacking routes in the South and East, including the Cantii Way, exploring forest tracks, bridleways and quiet lanes over 1 to 5 days. The cycle routes are suitable for beginner and experienced MTB and gravel-bike riders, are easily accessed by public transport, and are well served for accommodation and facilities.

Seasons
Most routes are accessible all year round but avoid the wet days of winter when the ground can be churned up.
Centres
All routes are easily accessed by public transport and can be reached from London by train within 1 to 2 hours.
Difficulty
Areas like the Chilterns, the Surrey Hills and Kent Downs offer challenging singletrack descents and hike-a-bike sections, while the Suffolk Heathland and Essex routes, while no less beautiful, are less challenging.
Must See
The heathland of the Suffolk Coast; Surrey's rolling hills; Epping Forest’s technical singletrack; the iconic White Cliffs of Dover; the bleak charm of the exposed beach at Dungeness; dozens of ruined castles and countless country pubs; views from Brightstone Down to the Needles on the Isle of Wight

The cycle routes are suitable for beginner and experienced MTB and gravel-bike riders and range between 69 and 249km (40–155 miles) in length. All routes are easily accessed by public transport and close to London.

Graded routes for all abilities
GPX files available to download 
1:150,000 maps and profiles included for each stage
Handy route summary tables and accommodation listings help you plan your itinerary
All routes easily accessible by train from London

(Source : Cicerone)