Fishing is often viewed as a country sport, but a new book describes 50 places in the UK where you can catch trout and other river fish just a short walk from a high street or city centre.

Evan Davis meets the author, river restorationist and fly-fisher Theo Pike for a lesson in urban angling.

Read more: Clean urban rivers get anglers hooked

You can listen to Evan Davis's report on urban fishing BBC Radio 4's Today programme.