Timothy West, Prunella Scales, Sheila Hancock and Gyles Brandreth embark on spectacular canal journeys across Britain and abroad

In a new two-part series, Timothy West and Prunella Scales head for the dramatic landscape of north-west Portugal, to embark on a voyage down the Rio Douro. From the sea, they follow the old port trade route featuring hilltop vineyards, on a journey that combines two of their favourite things - water and wine.