In 2012, Brinn was part of the Gold winning team at the 2012 European Gymnastics Championships in Montpelier. Later that year he was chosen to compete at the 2015 World Artistic Gymnastics Championships in Glasgow, Scotland where he helped the team qualify for the 2016 Olympic Games.
He was part of the first men"s team to win a Team medal at a World Gymnastics Championships for Great Britain in Glasgow on 28 October 2015. In 2014, he was again chosen for the Junior team at the European Gymnastics Championships in Sofia, Bulgaria where he not only helped to secure another Gold for the British team, but individually won silver medals on Parallel Bars and Still Rings, and Bronze in the All-Around behind his teammate Nile Wilson who won Gold and Valentin Starikov of Russia. In 2015, Brinn made his Senior debut for the international squad competing at the European Games in Baku where he won a Bronze medal on the Pommel Horse The team went on to win Silver in the Team Finals, which was Britain"s first team medal for the men (the women"s team had made history by winning Britain"s first ever team medal when they secured the Bronze the previous evening).
