National Trust Flag flies at Charlecote

I was shocked to see the National Trust flying its flag over the Charlecote gatehouse in May 2009. Have they conquered the place? Wikipedia reports that ‘The Lucy family, who came to England with William the Conqueror, has owned the land since 1247. Charlecote Park was built in 1558 by Sir Thomas Lucy, and Queen Elizabeth I stayed in the room that is now the drawing room.’ So why can’t we have the Cross of St George flying over Charlecote? ‘White for purity and red for valour’. The colours would be better, the symbolism far better – and the pulse would beat faster. Does the National Trust associate England’s ensign with lower class football hooligans?