One of my grandma's friends was British and was in Germany when the war broke out. Foreigners from enemy countries were usually rounded up and put into concentration camps (not death camps, that's just the name for them) so they got sent to one for British people. They would write each other through the red cross and there are pictures from the camp. They apparently had plays and carnivals and sports games. Not saying that not having freedom of movement wasnt bad but if I was a civilian prisoner of war it doesn't sound half bad. Near the end it obviously got bad, food and supplies became rationed, but they survived in good health before being repatriated.