Pentonville prison is significant to Sherlock Holmes because it is where Lord Blackwood was incarcerated and eventually hung. I found this information from a fan wiki. This source is an example of low barriers to entry and collective authorship because although anyone can post on it is it monitored by Sherlock Holmes fans. Mapping this location on COVE adds a grassroots layer to a story usually told top down as it was a maximum security prison and was mostly likely used to show just how dangerous Blackwood was shown to be.
Sources: https://bakerstreet.fandom.com/wiki/Pentonville_Prison
https://prisonadvice.co.uk/pentonville-prison/
Vetted?
No