Airship development in the United Kingdom lagged behind that of Germany and France. The first British designed and built airship was constructed by Stanley Spencer, and on 22 September 1902 was flown 30 miles (48 km) from Crystal Palace, London to Ruislip, carrying an advertisement for baby food. A series of more practical airships was constructed by Ernest Willows, the "Willows Number 1" making its first flight near Cardiff on 5 August 1905. The Royal Navy realised that airships similar to Ferdinand von Zeppelin's designs could be of great use and in 1909 ordered construction of a rigid airship. This was completed in 1911 but was wrecked while leaving the hangar before it had flown. Meanwhile, the British Army's School of Ballooning, later the Air Battalion Royal Engineers, acquired a small fleet of semi-rigid and non-rigid airships for observation purposes; they were taken over by the Royal Navy on the creation of the Royal Naval Air Service in 1914. A large number of rigid and non-rigid airships were mainly used to counter the U-Boat campaign in World War I. Interest in military airships declined at the end of the war, but some success in the commercial field inspired the Imperial Airship Scheme; however, the disastrous crash of the R101 in 1930 ended serious government and commercial interest in airships. Since the 1970s, there have been persistent efforts to revive a British airship industry, using new designs, materials and technologies.