I do of course always recommend the OS Pathfinder map at the end of each section.
It is not vital to have a map, there are OS maps in the guide, but some like to have the large scale map with them.
I must say that I am finding the new Harvey’s Thames Path map (£12.95) extremely satisfying. All the route is on one lightweight waterproof map.
Key pubs are marked and the locks which are a walker’s stages are prominent.
It’s a pleasure just to read at home when contemplating either the full trail or just an outing.