I found this on the BBC website about that programme.
'Ramblings' with Clare Balding
Programme 2:
Birmingham - the Cole Valley
First broadcast Friday 6 April 2001, 3.00-3.30 p.m.
Companion: Peter Bennett, local resident and conservationist.
Clare and Peter walk from Sarehole Mill through Moseley Bog - which both have connections with J.R.R. Tolkien, author of Lord of the Rings - and past Swanshurst Park, which used to be farming land. They continue over common land at Billesley, by the Chinn Brook and round Trittiford Mill with its bats and breeding swans, then back along the Mill Stream Way in the Cole Valley to Sarehole Mill.
Map: Ordnance Survey Explorer 220. See also: Birmingham A-Z.