When talking about him, it would be ‘Captain Aldrith Scumbag-Newelle, Lord-Consort Newelle’, as he’s hyphenated his surname with his wife’s, but that’s distinct from his title within her House.
Talking to him, he’d be ‘Lord-Consort Scumbag-Newelle’, ‘Aldrith’, or ‘Captain Hairgel’, I mean, duh.