Sorry if this has been flagged up already, but the first of a new 3 part series is on Channel 4 this Sunday at 8pm.
Digiguide gives this info:
TRAVEL: Great Canal Journeys
Channel: Channel 4 HD 104
Date: Sunday 25th October 2015
Time: 20:00 to 21:00 (starting in 3 days)
Duration: 1 hour.
In the first of a new series, actors and canal lovers Timothy West and Prunella Scales go in search of London's lost route to the sea. They navigate from the Thames at Teddington, through the Surrey and Sussex countryside, to Littlehampton on the south coast. The journey takes in four different waterways and four separate boats, as they follow a route that was last fully open two centuries ago. They explore the beautiful, almost forgotten Wey and Arun, where time itself seems to move at a slower pace. Their voyage back through canal history also leads Tim and Pru into their own past. The Wey Navigation takes them through Guildford, to its canal-side theatre where they have been regular performers for fifty years. At the Surrey village of Sutton Abinger, they pay a visit to the picturesque cottage where Pru was born. And for the final leg of the journey, Tim and Pru transfer onto the River Arun, travelling past Arundel Castle to Littlehampton and the English Channel.
(High Definition, Subtitles, Part 1 of 3, Audio Described, Episode 1, 4 Star)
Excerpt taken from DigiGuide
The second programme covers their journey from Brum to Braunston. I have no info on programme 3.