Having just joined the forum after a number of years buying MEW, I browsed through the various topics and found this one. I feel I can add some history.
Thomas George John was born in 1880 in Pembroke Dock, won scholarships to the Royal College of Science, was a Whitworth Exhibitioner and worked for various well know companies before buying Holley Brothers in February 1919, mainly for the premises and skills in Coventry.
An early venture was involvement with Stafford Auto Scooters Ltd in the motor scooter, the Stafford Mobile Pup. The frame was supplied by The Birmingham Motor Guild and the engine was built and fitted by T.G.John Ltd.
Apparently Mr Stafford had a shop at the bottom end of the TGJohn works in Hertford St.
TGJ went on to found Alvis Ltd for the manufacture of Alvis motor cars.
The above is a synopsis of the early pages of the book produced by the Alvis Register entitled The Vintage Alvis.
Two members of the Register own Pups and one was part way through restoring his.