As I have mentioned before, the latter is a trick much practiced by Georgette Heyer. She allows the events and settings of her novels to date the story without hitting us over the head with the calendar. Activities and settings such as a visit to the Elgin Marbles (Cotillion), riding on a pedestrian curricle (Frederica) and the Duchess of Richmond's Ball before the Battle of Waterloo (An Infamous Army) help to plant the story in a clear time and space. It subtly assists us in populating our imaginative world.
I would like to be able to say that this is why I spend time on (for example) working out when women started wearing bare toes in their sandals or donning pince-nez, but the sad fact is I am just an irredeemable geek where social history is concerned and I find details like this absolutely fascinating. Hence I have just spent too long a portion of my life trying to find out the answers to the followed questions:
1. When was gas lighting was first used in domestic homes?
2. Would the hall walls in a relatively affluent Regency household be hung with paper, silk or painted?
3. Where would a fashionable courtesan live in Regency London?
Measuring Worth website). People got round the tax by buying plain wallpaper and having it hand stenciled. To demonstrate her fashionable and affluent status, my heroine's sister would probably have the most popular and expensive wallpaper design, such as stripes, Rococo designs or flock patter which imitated velvet. For an example of some expensive painted wallpaper in the Chinese style see this sample on the Victoria and Albert Museum website, created c.1810 - 1830.
And when would my heroine's sister (who by now you may have gathered is an affluent courtesan) have lived? According to Dan Cruickshank she would most likely have dwelt in on of the elegant villas which had sprung up in the Georgian building boom in Soho or Marylebone.
A word of caution
I am really enjoyed reading my way through Stephen King's On Writing at the moment and one of the points Mr King makes is that when writing, you should just write. If you don't know the name for something or (my example) when gas lighting was introduced, put a place holder in and then go back to it when the story is done. Just get the damn story down. It's good advice. But those titbits of knowledge are just sooooo tempting!
For a guide to lighting in the Victorian Home (which also covers aspects of Georgian lighting), see this wonderfully researched article by Jonathan Taylor.
For a short history of wallpaper see this article on freepedia. The For Romance Readers Blog references the Georgian tax on wallpaper and thus its use as a symbol of wealth and extravagance. The specifics of the tax itself is described in more detail here. The introduction of wallpaper to the Georgian home is covered in this article on the History of Wall Panelling in Interior Design Projects.
For the impact of prostitution on building in Georgian London, see Dan Cruikshank's The Secret History of Georgian London: How the Wages of Sin Shaped the Capital (Random House). Some of the points Cruikshank makes are summarised in Harlot's Progress, an article in the Economist which reviews Cruikshank's book.