War II was a special Bentley Mark V, chassis 11-B-V, fitted with a bored-out 6.3 litre eight-cylinder engine. Although the official Experimental Department name for this car was Comet, its scorching performance earned it the fond epithet Scalded Cat. This unit in particular would later play a key role in the decision of creating the Phantom IV. Indeed, the Duke of Edinburgh heard about the Bentley nicknamed Scalded Cat in 1948 and asked if he might test it out. He enjoyed this experimental car immensely and drove it for considerable distances. When he returned it, he apparently murmured about how nice it would be to have a car with performance in the Royal Mews. On 15 November 1948, not long after Prince Philip had driven the aforementioned automobile, an order came through for a Rolls-Royce motor car for Princess Elizabeth and Prince Philip. They placed the order through The Car Mart, Ltd., RR official retailers. Such a vehicle would have to meet their official needs, which meant it must be a limousine. It would also have to have good performance, since the Prince wished to drive it himself. The car would be the first Rolls-Royce in the stables. It was originally planned to be the only Phantom IV, a strictly one-off piece. Rolls-Royce, aware that Daimler had held the royal warrant to provide motor cars since 1900, was very keen to ensure that the car was the best there had ever been, and a great deal of hand work was lavished on the construction of the chassis. The board members had earlier considered making a replacement for the pre-war Phantom III, but they were wary that such a large and expensive car might not have a market in the weak post-war economy. Production of the first two units of the new model was not at Crewe, but at the experimental Clan Foundry at Belper, which had been the home of the motor car branch during the Second World War. The experimental department still continued there until the closure of Clan Foundry in 1950, when it was finally transferred to Crewe. The chassis 4AF2 was built under the code-name Nabha, and Mulliner was selected as the coachbuilder, so they prepared drawings for approval. The chassis was delivered to them on 20 July 1949 for erection of the body. Prince Philip visited the workshops more than once while it was being built.