SPOILERS FOR BEING HUMAN SEASON 4 FINALE (because I know that there is one person in our fillage doing their first watchthrough)
Anyway, I really really enjoy imagining that Mitchell and Gilbert had the same relationship dynamic as Hal and Alex. Like Mitchell was tangentially responsible for Gilbert's death in some way. And both Gilbert and Mitchell are both too stubborn to leave Bristol so they sort of just ignore each other until Mitchell decided that his new ghost friend needed a buddy.
Has to be Georgian (1714-1830) probably more the regency era if I had to narrow it down. Lots of favourite Georgian programmes from then but also books and general historical interest. It's got that age of empire romanticism (granted not a very nice time for 'the savages' being 'enlightened' by the empire, to put it mildly, but good from a fictional point of view).
Outrageous fashion, beautiful architecture, romantic dancing, a cultural yearning for the pursuit of knowledge and art, a class system that was rigid in its roles yet traversable through hard work/luck/marriage/dastardly doings, whispers of war and revolution creating characters that are handsomely heroes/lovable rogues/cutthroat villans mixing with those from small country towns with no outside communication that are adorably nieve...