re Internment try
http://www.ee.surrey.ac.uk/Contrib/manx/famhist/genealgy/intern.htm
(I have been told that the PRO have also updated their site with a bit more info)
Though most internees lived at Knockaloe some of the wealthier ones lived in Douglas - the Manx museum have some 50,000+ photos (mostly unindexed though!)

Frances