This month’s mystery is a submarine, which is pictured at Weymouth in 1947. Or is it Portland? Can any reader supply more information about the exact identity of the boat? Where and when was she built? How long was her service career? Did she serve during World War II and in what capacity? And what was her eventual fate?

Send your answers, including a postal address, via email to sm.ed@kelsey.co.uk, or by post to Mystery Ship, Ships Monthly, Kelsey Publishing, Cudham Tithe Barn, Berrys Hill, Cudham, Kent TN16 3AG.