Yes 1970, but final trolleybus operations were in Bradford, West Yorkshire in 1972.
The last trolleybus built for UK service was for Bournemouth.
The nail in the coffin for Walsall was the formation of WMPTE.
Two Walsall trolleybuses, 342 NDH 959 which is awaiting restoration and 872 XDH 72 which is the one in the photo posted by roy one and are at the Trolley Bus Museum, Sandtoft which is between Doncaster and Scunthorpe. One (862) also exists at the Black Country Museum.
Also at Dudley is a Wolverhampton trolleybus 433.