High Quality Content by WIKIPEDIA articles! The Great Subscription Purses were a series of flat horse races in Great Britain run at York Racecourse, usually over a distance of 4 miles, that took place each year in August from 1751 to 1833. During the second half of the 18th century they were amongst the most important races in the county, but during the 19th century their importance declined as racing became more focused on shorter distances.