Son of legendary City keeper Bryan Gunn, Angus played for Norwich's Under-15s in their victorious Eendracht Aalst Tournament campaign in May 2010. He was then called up to the England Under-16s for the Victory Shield matches in October 2010

Angus made his first start for Norwich's Under-18s in their 1-1 draw with Crystal Palace on 5th February 2011

Gunn made his debut for England's Under-16s in a friendly against Slovenia on 16th February 2011, keeping a clean sheet before being substituted at half-time.

When his father relocated to the North West in May 2011, Angus followed and is expected to join a North-West side with Man City already linked to the goalkeeping prodigy. Bryan explained the switch away from Norfolk, with him getting a new role with a sports agency. “This is a good opportunity to get back into the sporting arena. For Susan it is also an opportunity to extend her art work to Manchester, where she has exhibited in the past. Our daughter Melissa is also going to Manchester University. Angus, as a 15-year-old, will hopefully come and we’ll find a good school where he can finish off his GCSEs and a football club which can further help develop his skills.” It was announced at the end of June 2011, that Angus had joined Man City's youth set-up.

Angus made his debut for Man City's Under-18s against Marseille in the Next Gen series on October 6th in France, losing 3-0 as usual keeper Eirik Johansen was away on international duty with Norway Under-21s

A tribunal ruled in December 2011 that Man City were to pay Norwich £250,000 for Gunn, although the Canaries were asking for £1million. Norwich will however get add-ons dependent on Gunn becoming a first-team player at the Etihad and ultimately succeeding England number one Joe Hart.