First light British tank with a 3 man crew.
The size of the driver's hatch was reduced.
Had a larger, rounder, turret with sloping sides than the Light Tank Mk IV.
At the bottom of the turret was a pedestal that contained the radio batteries, ammunition, and the gunner's seat.
The gunner also operated the radio. The way that the rear of the turret sloped made it difficult for a radio to fit. The gunner could use his shoulder to elevate the guns. There was a sighting scope with two scales, one for each gun.
The commander had a round cupola in the top of the turret.
There were 213 ball bearings in the ball race. Six clips held the turret on.
One turn of the traverse wheel moved it 3°.
To allow for larger fuel tanks the rear was lengthened, and a rear idler added, which added to the weight in the back and improved handling. Return roller was added.