I just noticed that in ch.11, Captain Harville is described this way:
Captain Harville was a tall, dark man, with a sensible, benevolent countenance: a little lame; and, from strong features and want of health, looking much older than Captain Wentworth.
In P2, it's Ciaran Hinds who is the dark one with (comparatively) strong features, so I think I may have to readjust my mental picture of Captain Wentworth et al... (Nah, I think I'll just leave it as is, with the exception of P2's Captain Benwick! ;-)