In 1943 an attempt was made to produce a 17-pdr gun armed tank on the Churchill chassis. It was known that sufficient numbers of the 17-pdr Challenger cruiser were not going to be produced in time for the invasion of Europe, and work was only starting on the Centurion cruiser design. Due to the wider turret required, Vauxhall had to redesign the hull though it used as much of the Churchill Mark VII as possible. This resulted in the Tank, Infantry, Black Prince (A43). Six prototypes were built and delivered in May 1945 just as the European war was ending. The test programme was completed but the project was cancelled due to the emergence of the new and less complicated Centurion Mk1 which offered the same armament and armour and had just entered production.