If you google The national archives and divorce it should bring up a page that shows the date ranges and the survivability of divorce records. Off the top of my head, recent divorces such as your own would have to be ordered direct from the court that issued it. Historic divorces between 1858 and 1916 are on Ancestry. 80% divorce case files from 1916 to 1937 survive. Few divorce records after 1937 survive.