sentences:  In 1968 a Jump Racing Pattern Committee headed by Lord Leverhulme recommended the creation of a formal NH Pattern, which came into being in 1969 with 14 races initially.The Pattern underwent further revisions in the 1980s and was subject to a major change in 1989 when the Jockey Club, the governing body of British horseracing at the time, overhauled the Pattern to create a mid-season and season-ending Grade 1 race in each of twelve categories, with lead-up Grade 2 races and a set of 14 major handicaps of Grade 3 status.This forms the basis of the current Pattern, which has since been subject to further changes in status and number of races.