The Avro 720 was a project for a rocket fighter that could act as a point-defence interceptor in order to comply with the Air Ministry's Specification F.124T. Such specification was issued back in 1949 and was greatly inspired by other war-time point defence interceptors like the German Messerschmitt Me.163. As technology advanced, the initial version was expected to be armed with at least two 20mm Hispano Mk.V cannons, but later, as the missile technology was developed, they were replaced by just two Firestreak missiles. One mock-up 1:1 scale model was made and a flyable prototype was expected to be ready in 1956 but the programme was cancelled in May 1955.
The Avro 726 was a development of the 720 intended to serve as escort or interceptor, while the Avro 728 was a naval version intended to serve with the Fleet Air Arm. They were projected in January 1954 and early 1955 respectively. However, of these last two we couldn't find blueprints or reliable drawings, so, unfortunately, they're left undrawn.
Sources:
1. Midland Publishing - British Secret Projects - Jet Fighters Since 1950
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