In 1945 Polkemmet House became the 'Trefoil School', originated during the war when a group of people associated with the Girl Guide movement volunteered to take care of handicapped evacuee children there. It was officially opened as the Trefoil School on 25 September by the Princess Elizabeth (Now the Queen). She later became the school's patron. The Trefoil School remained here until 1951 when it moved to Gogarburn, Edinburgh. During this time at Polkemmet the school was visited by some important visitors including, Chief Scout, Lord Rowallan and Princess Mary, the Princess Royal. Following this, the building became the Scottish Police training school before being demolished by the National Coal Board.