London Green
The River Lea flows south into London, cutting a swath of green into the heart of the Big Smoke as far as Walthamstow and Hackney. John Andrews leads a radio nature trail along the banks of the river which Isaak Walton fished over three centuries ago, all within shooting distance of St Paul's.
Presenter Derek Jones Producer BRIAN LEITH BBC Bristol
(Repeated: Thurs 9.30 am) long wave only