Hardy Spicer, as part of the Birfield Industries group had a medium size factory making universal joints for cars on the corner of Birch Rd and Brookvale Rd in Witton . I worked in a nearby Birfield factory which supplied forgings to HSP. Both factories are highlighted in the photos below.
The original factory ....
View attachment 152344
View attachment 152345
images source ... 'britainfromabove'
HSP developed a 'constant velocity' joint needed for front wheel drive cars (Mini) and moved to a much larger site on the Chester Rd.
GKN made a successful takeover of Birfield Industries in 1966 and eventually became a global supplier of car transmissions with factories in many parts of the world. I watched all this happening and travelled and worked in factories ranging from Sanford in North Carolina, Trier in Germany, and Poissy in France.
Over recent years I've watched much of it close down. The GKN factory I worked in at Great Barr was demolished to make way for a supemarket (never built) and the large modern plants in Sanford NC have been closed and demolished.
I retired just before the decline and closures started and admit to being a Melrose Industries shareholder. They compulsorily purchased my GKN shares ...
Electric cars appear to be the 'future' and will probably move to direct computer controlled motors on each wheel needing different transmissions.
for some background information visit https://en.wikipedia.org/wiki/Hardy_Spicer