Walled Kitchen Garden at Croome Court (Worcestershire), which has links to William Shenstone
Walled Kitchen Gardens Network (a link between many such gardens with expert advice)
Country Walks Around Halesowen's Green Borderland: Halesowen Abbey Trust member, Roy Burgess, has written a series of walk leaflets. Eventually four will be available. Walk 2A. "Leasowes & Abbey Lands" includes our Walled Garden.