From Kellys directory 1921
Abingdon Works Limited, manufacturers of the celebrated "King Dick'' cycle fittings, tricycle axles, spanners, " Ecco" brakes, lubricators &c. ; motor cycles, motor car parts made to order. All work on the interchangeable system ; made of the best material & workmanship guaranteed mathematically correct, King's road, Tyseley, Acock's Green
They were also there in 1912. Some firms in WW1 guaranteed males who went to war that they would have jobs after the war (meaning women who worked over the war usually got the sack) but many did not, so I think that without any evidence it is impossible to know whether he worked there before. There were many cycle and accessory manufacturers around both pre and post war