Barrett was born in 1891, at Prestwood Road,
Heath Town,
Wolverhampton, one of nine children. His father, George Barrett, had been born in rural
Essex but came to Wolverhampton and worked in engineering factories. Tom and his eldest brother William served apprenticeships at the pump-making factory of Joseph Evans & Sons, where their father also worked. After the end of the war, the aero-engine work at Guy was closed. Barrett's appetite for aero-engines had been whetted though and he moved to the nearby
Sunbeam works so as to continue it. The market for aero-engines at this time was flooded by war-surplus and so Sunbeam focused on new engines for
airships. By 1921 though, airship accidents made this work less attractive and so Tom moved into Sunbeam's 'Experimental Department', supporting their successful racing cars, including the
Sunbeam 350HP. Sunbeam's road cars were highly regarded in this period and the prestige and engineering innovation derived from the racing effort was seen as a significant part of this. ==1924 accident==