I think that Rosie F's question on Holmesian Streets is really interesting and that their answer is a great starting point but not a complete answer.
I would quite like to instigate a Community Wiki answer to allow people to pitch in with their own thought and research in a collaborative effort that would become more complete over time.
However, I cannot find any source purporting to offer complete gazetteer of street names occurring in the Holmes stories from which one might start to sort the real from the unreal, altered or borrowed streets.
Would it be in order to use the putative list presented in Rosie F's answer as a basis for a Community Wiki, imagining that it would be both added to and subtracted from over time? Or would that be an infringement of Rosie's work, or perhaps more importantly, just seem rude?
I'm aware that the comments I have made seem like picking at someone's answer, where what I would really prefer is a collaborative and constructive way to combine forces and which might allow for discussion rather than appearing to try and 'trump' other contributors.
Suggestions for the best way forward gratefully received.
To be clear, I'm no Holmesian aficionado, or Conan-Doyle buff, but I do like ferreting at old map sources and if people fed potential names into an answer I could indulge myself no end in chasing them down.