Prisoner of War Army Post Office envelope

Envelope from the Alliance Assurance Co. Ltd. addressed to Corporal G J Williams, 5775547, D Company, the Royal Norfolk Regiment, 5th Battalion, sent 10.11.41, returned 10.2.43. Stamped "Army Post Office. It is regretted that this item could not be delivered at the address stated." Corporal Williams was a Far East Prisoner of War.