I wonder:
During World War I the British government interned male citizens of the Central Powers, principally Germany, Austria-Hungary and Ottoman Turkey. They were held mainly in internment camps close to Peel, and a smaller one near Douglas.
http://www.gov.im/mnh/heritage/library/bibliographies/internment.xmlshows what records are available. But ...
http://archiver.rootsweb.ancestry.com/th/read/SUSSEX-PLUS/2001-08/0996904696(Extract of non-copyright site):
"Very few records of individual internees survive for the First World War.
Specimen lists of German subjects interned as prisoners of war in 1915 and
1916 can be found in WO 900/45 and WO 900/46 and a classified list of
interned enemy aliens can be found in HO 144/11720/364868 , a facsimile copy
of which is available in the reading rooms at the PRO. Nominal rolls of male
enemy aliens of the age of 45 and upwards, submitted to the Secretary of
State by commandants of internment camps, are included among a census of
aliens in the United Kingdom from 1915 to 1924 in HO 45/11522/287235 .
References to individual internees can also be found among the card index to
the Foreign Office general correspondence in the PRO. Any reference found on
a card needs to be turned into a modern PRO reference. Not all files have
survived".