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Description
"In 1941, the General Staff requested an investigation looking into the possibility of mounting high-velocity cannons onto tanks. The Valentine or Churchill were ill-suited to mounting anything larger than a 6-Pounder (57 mm/2.24 in) or 75 mm (2.95 in) cannon in their turret. As such, it was decided to mount the cannon in a superstructure with a limited traverse.
What came out of this was the Churchill Gun Carrier. Under the officially long-winded designation of Gun Carrier, 3-inch, Mk I, Churchill (A22D), this vehicle was the first and only conversion of the Churchill chassis into an Assault Gun/Tank Destroyer.

The Gun Carrier was built onto the unchanged chassis of a Churchill. It is unclear what Churchill version was used, but it seems likely it was a Mk.III. It kept the same engine and drivetrain. The turret and forward hull were replaced with a fixed 88 mm (3.5 in) thick box casemate. The bow machine gun emplacement was also removed. On the left side of the casemate, in a ball mounting, sat the vehicle’s main armament. This was the QF 3 inch (76 mm) 20 cwt anti-aircraft gun.
Being a WWI era weapon, the QF 3 inch was obsolete at the time of this vehicle’s development. It had previously been used aboard Navy ships in an Anti-Aircraft role. Vauxhall was provided with 100 guns when given the task of constructing the tank. The cannon would fire a 12.5 lb (5.7 kg) shell at 2,500 feet-per-second (760 m/s). The same cannon was mounted in one of the many prototype turrets for the TOG II. In its ballmount, the gun could depress -10 degrees, and elevate 15. More than enough to peak over a rise without exposing too much of the vehicle.

Some Gun Carriers were adapted for experimentation and training with the Snake, a line-charge mine-clearing device. This was an oversized version of the infantry carried Bangalore, designed by the Canadians to be equipped on special mine-clearing vehicles. This conversion consisted of removing the gun, and mounting banks of up to 25 Snake tubes either side of the armored casemate, giving the vehicle a total of 50 Snakes."

-Tank Encyclopedia

Description
"In 1941, the General Staff requested an investigation looking into the possibility of mounting high-velocity cannons onto tanks. The Valentine or Churchill were ill-suited to mounting anything larger than a 6-Pounder (57 mm/2.24 in) or 75 mm (2.95 in) cannon in their turret. As such, it was decided to mount the cannon in a superstructure with a limited traverse.
What came out of this was the Churchill Gun Carrier. Under the officially long-winded designation of Gun Carrier, 3-inch, Mk I, Churchill (A22D), this vehicle was the first and only conversion of the Churchill chassis into an Assault Gun/Tank Destroyer.

The Gun Carrier was built onto the unchanged chassis of a Churchill. It is unclear what Churchill version was used, but it seems likely it was a Mk.III. It kept the same engine and drivetrain. The turret and forward hull were replaced with a fixed 88 mm (3.5 in) thick box casemate. The bow machine gun emplacement was also removed. On the left side of the casemate, in a ball mounting, sat the vehicle’s main armament. This was the QF 3 inch (76 mm) 20 cwt anti-aircraft gun.
Being a WWI era weapon, the QF 3 inch was obsolete at the time of this vehicle’s development. It had previously been used aboard Navy ships in an Anti-Aircraft role. Vauxhall was provided with 100 guns when given the task of constructing the tank. The cannon would fire a 12.5 lb (5.7 kg) shell at 2,500 feet-per-second (760 m/s). The same cannon was mounted in one of the many prototype turrets for the TOG II. In its ballmount, the gun could depress -10 degrees, and elevate 15. More than enough to peak over a rise without exposing too much of the vehicle.

Some Gun Carriers were adapted for experimentation and training with the Snake, a line-charge mine-clearing device. This was an oversized version of the infantry carried Bangalore, designed by the Canadians to be equipped on special mine-clearing vehicles. This conversion consisted of removing the gun, and mounting banks of up to 25 Snake tubes either side of the armored casemate, giving the vehicle a total of 50 Snakes."

-Tank Encyclopedia