If you need to get a map, I'd recommend the one by Imray. It costs less than a fiver, and has the whole route on a single sheet. It also has a useful mile countdown to Teddington, as well as marking all the pubs and other facilities en-route.

A useful aid for explaining your epic undertaking to potential sponsors.

It is available at many fine boating outfitters and map shops as well as at amazon.