Captain Burns is the father of Melinda Burns (who is listed in the cast page). Briana has appeared before (though no name was listed for her at the time), in two comics during the Ian (Thoughts in the Rain): section.
Burns will have a formalized cast entry later today.
And tonight I saw the last Foyle’s War. A great show, can’t recommend it enough. Another one to see if you can at all do so.