It's Cluedo in a Wooden Box in the 1949 style including the history of the game.
I went to my local Tesco yesterday and had a look down the discontinues aisle, there were 3 of them left but I didn't check the other games aisle which also contains the discontinued games.
They are reduced from £19.97 to £4.99. They are also at £24.89 on Amazon! Get in there while you can.