british soldier norman turgel and teenage polish girl gena met at belsen .
he was sent to arrest her ss guards - and fell in love with her .
commander major leonard berney took a personal interest in the romance .
made sure messages to each other reached their destination amid chaos .
the pair wed months later when gena , now 91 , was 20 and norman was 24 .
stayed married for 50 years , living in london , until norman 's death in '95 .