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In page De Havilland Mosquito:

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In the aftermath of the Battle of Britain, the original order was changed to 20 bomber variants and 30 fighters. Whether the fighter version should have dual or single controls, or should carry a turret, was still uncertain, so three prototypes were built: W4052, W4053, and W4073. The second and third, both turret armed, were later disarmed, to become the prototypes for the T.III trainer.[8] This caused some delays, since half-built wing components had to be strengthened for the required higher combat loading. The nose sections also had to be changed from a design with a clear perspex bomb-aimer's position, to one with a solid nose housing four .303 machine guns and their ammunition.[9]