Many German submariners who got caught during the war, did not go prison as we know it.
They were held in Grizedale Hall, now defunct, is that the place?
Liverpool connection:
In 1903 Harold Brocklebank, a wealthy Liverpool based merchant and shipping magnate bought Grizedale estate. He was born in 1853, being the third son of Sir Thomas Brocklebank, 1st Baronet. After the old hall was pulled down, Harold Brocklebank completely rebuilt Grizedale Hall in 1905, the interior design having been completed by 1907. The architects of the new stone-built 40-room mansion in neo-gothic style were Walker, Carter & Walker of Windermere, Cumbria. Brocklebank inhabited Grizedale Hall with his wife Mary Ellen Brogden, three daughters and two sons until his death in 1936, when the hall and the 4,500 acre estate were taken up by the Forestry Commission. After serving as the first prisoner-of-war camp in the United Kingdom from 1939 to 1946 the hall stood empty. Due to its high maintenance costs the Forestry Commission auctioned off the fittings, fireplaces and staircases and demolished the hall in 1957, leaving only the single-story adjoining building with storage rooms on the east side of the hall as well as the garden terrace. Some architectural remains of the hall like the walls and stairs of the massive garden terrace and the close with its gates can still be seen today, the car-park of the Grizedale Forest visitor centre being placed on top of the internal side of the former house.
Source:
http://en.wikipedia.org/wiki/Grizedale_Hallhttp://www.bbm.org.uk/Grizedale3-opt.jpg 
