Correct me if I'm wrong, but isn't the BBC show
Skins set in Bristol? Some of the underground club/drug scenes could definitely be under the sway of the White Court, and/or some of the more malicious fae.
Also, even though (or perhaps especially though) you're a Bristol native, it would certainly be worthwhile to go have a look at the local tourist office and any local historical societies. You're liable to find out bits of local history and lore which you were ignorant of.
A case in point, I'm (more or less) a Connecticut native, in an area where some of the oldest English speaking settlements were founded. Despite having grown up in the area, I was completely unaware that one of the settlements, now known internationally as the City of New Haven and home to Yale University, had a series of four coastal fortifications built to defend the harbor. Or that the oldest fortification, now lost, was built ~1658, or that two of the fortifications were actually used in battle (against the British of all people
). By interesting coincidence, the site is now reportedly haunted...
Given how much older the Bristol is, given the evidence of Iron Age hill forts in the area and the fact that the Bristol suburb of Sea Mills was known to the Romans as
Portus Abonae suggests that there is plenty of local color available if you dig deep enough. In some cases, literally.
Speaking in more general terms, what you might want to do is find, or choose a few key Aspects for you version of Bristol, and then decide which supernatural faction or factions best work with, or represent those Aspects.
As we have already seen from the novels, the Red Court for instance has a strong hold on Latin America and parts of Africa, while the Black Court used to have influence in parts of Central and Eastern Europe, and the White Court has/had some tie to Italy. If there are particular local neighborhoods within Bristol which might cater to those particular populations, or have a reputation for activities which might seem to be the work of the Red Court for instance, have a tie-in, things like that.
-Cheers