Built as a private home in the last quarter of the 18th century Pannal Ash was many things including a convalescent home for RAF Officers during the second World War.
It was purchased by the West Riding County Council in 1945 to train police recruits from the northern constabularies and became the No3 District Police Training Centre, a Home Office establishment.
In 1974 it became the police Regional Central Planning Unit.
2003 saw a major revamp across its 23 acres with accommodation for 423 students. 72 Training officers and, 70 residential staff.
In 2011 the National Planning Improvement Agency announced that it would close the following year as part of a governmental cost-cutting exercise. At the time there were between 176 – 184 teaching and training staff.

