I know that the U.S sent Japanese-Americans to camps to live in during the war. Was this type of method used by the British? I know they wouldn't have been treated well by the general population but i's not sure if the government sent out a lot of Anti-German propaganda to these people.
In the build up to the war Germans, Italians etc. living in Britain were interned in camps, however that policy was quickly reversed and by 1940 most had been released or deported and many had join the allied war effort.
Of those captured from the German armed forces or intelligence services and sent to POW camps, 24,000 (out of 400,000) chose to remain in Britain after the war.
Your assumption that the general population didn't treat them well is not supported by the evidence, many POWs worked alongside British people and ended up settling, marrying local women etc.
There was a great deal more anti-German feeling in WWI, but people were generally understanding about the effects of Nazi propaganda and were more sympathetic to ordinary Germans in WWII.
http://www.bbc.co.uk/history/ww2peopleswar/timeline/factfiles/nonflash/a6651858.shtml
http://www.bbc.co.uk/history/british/britain_wwtwo/german_pows_01.shtml