Sandringham time
Sandringham time is the name given to the idiosyncratic alterations that King Edward VII made to the timekeeping at the royal estate of Sandringham. This time corresponds to UTC+0:30, and was used between the years 1901 to 1936.
Contrary to rumour, it was not begun to assist Queen Alexandra, who was constantly late, but to "create" more evening daylight for hunting in the winter.