His first rally was in 1989 driving a Vauxhall Nova. In 1993 he won the UK Colway Tyres budget championship in a 1300cc Vauxhall Nova, ahead of drivers with more powerful cars.[2]
In October 2015, Armstrong and regular co-driver Paula Swinscoe were crowned the 2015 Scottish Rally champions.[3] During the Jim Clark Reivers rally in May, Armstrong and Swinscoe were given a 1-minute time penalty dropping them from first to third place, however following an appeal in late September this was overturned and the pair were granted the win.[4] By the end of the season they had achieved two wins and three second places in their Subaru Impreza.[5]
SRC season 2016 saw Armstrong and Swinscoe repeat their feat and crowned Scottish Rally Champions for the second year in succession. After a close run season in 2017 they finished runners-up in the SRC title race.
