There have been many famous TV and non RSC theatre adaptations of Richard II as well with many famous actors in the lead.
On US TV, NBC Hallmark Hall of Fame presented Richard II with Maurice Evans in the lead - US audiences probably know him better as Maurice, Samantha's father on Bewitched and his portrayal of Dr. Zaius in Planet of the Apes. But he made his Broadway debut in Romeo and Juliet and he became famous for his Richard II on Broadway in 1937.
Ian McKellan starred in the 1970 BBC production and then Derek Jacobi in 1978, again on the BBC with John Gielgud appearing as John of Gaunt. Gielgud made the role of Richard his own back in 1929 at the Old Vic and reprised it again in 1937 and 1953. This final performance was considered the definitive performance of the role.
2005 saw Richard II in a modern dress production at The Old Vic which starred Kevin Spacey as Richard.
Former RSC director Deborah Warner, who directed David in The Last September directed a TV movie of Richard II in a controversial production with Fiona Shaw as the lead, in drag. They had originally staged the play at The National in 1995.
In 2003 Mark Rylance appeared in an all male cast at The Globe as Richard which saw one performance televised on BBC Four as a live & interactive broadcast which included interviews, commentary and backstage tours.
In 2012, as part of BBC Two's Shakespeare Unlocked season for the cultural Olympiad they screen The Hollow Crown, a mini-series of four of the history plays, Richard II, Henry IV parts 1 & 2 and Henry V. Once again we got to see Mark Rylance as Richard.
To date there has never been a theatrical version of Richard II!