Such did exist:
http://en.wikipedia.org/wiki/Sandringham_HouseSuch was Edward VII's fondness for hunting on the estate, he ordered all the clocks to be set half an hour ahead of GMT to allow more time for the sport. This tradition of Sandringham Time was kept on the estate from 1901 until 1936 when the new King Edward VIII showed he was "a new broom" by sweeping the custom away.[4]