As I understand it, the Vanguard was a planned tank (or is it more appropriate to call it a variant?) based on the Valentine, with the individual wheel suspension of the Valiant. But - per a discussion here previously - apparently the Soviets wanted to keep receiving Valentines, so the plan was scrapped. Would the hull and turret of the Vanguard have been the same as the Valentine's? Were any Vanguard prototypes built?