Due to its proximity to central London and the local railway network, the site attracted industrial companies and buildings began to be constructed in the area, which soon became known as Park Royal.[5] In 1939 the stadium introduced the Guineas competition and the Crowley trained Musical Duke provided Park Royal with their first major success after winning the Laurels in 1939.Trainers included H Gray, G Clark, Dave Barker, O'Hea, A Forman, Jack Kinsley, Bill Hennessey and Stan Gudgin.The leading bookmaking firms behind BAGS would pay the National Greyhound Racing Society (NGRC) a set fee for the off-course rights.[8] Despite the income received through the BAGS contract, the stadium closed quite suddenly on 22 January 1969 following the conclusion of a speculative deal to redevelop the site.