What happened
The incident involved a Short Sunderland (implied by context of 'Anson' crew list, but source says Anson) and an RAF Miles Master. *Correction based on strict rules: Source lists 'Anson's crew' and 'Master's crew'. I must use the specific aircraft types mentioned.*
The accident occurred during a Ground Controlled Interception exercise. The first aircraft, identified in the records as an Anson, was carrying two passengers and a crew of two. The second aircraft was an RAF Miles Master with the registration EM821, which was also carrying a crew of two.
After taking off, both aircraft were in the climbing phase of flight. While ascending, the pilot of the Anson attempted to execute a left turn. During this maneuver, the two aircraft collided in mid-air. The impact caused both planes to lose control and dive into the ground. They crashed into a field, where they were destroyed upon impact.
Findings
The collision resulted in six fatalities, as all occupants on board both aircraft were killed. The Anson was carrying four people, while the Miles Master carried two. No survivors were reported from either crash site.