The intel wasn't particularly correct, as there was never a heavy Vickers tank (although the Soviets tried to get Vickers to design one). 12-ton Vickers tanks did exist, and the USSR bought a number of them (14-16, depending on the source). However, unlike the Vickers 6-ton, which birthed the successful Soviet T-26 tank, its fatter cousin was not met with much enthusiasm.
A plan existed to equip these tanks with Maxim machine guns and dig them in as bunkers. However, according to German photos, the Soviets never bothered. The tanks were left to rust out in the open until 1941.