More local to London graves that are worth visiting are at
Bunhill Fields, , which I don't think is as well-known as it should be. John Bunyan, Daniel Defoe and William Blake are the two most famous people there; I love Bunyan's Pilgrim's Progress and basically everything by Blake, a beautiful madman that I suspect would have fit well into Urban.
It's also a well-kept cemetery. Unlike most other central London cemeteries, it feels like a cemetery rather than a park with gravestones - there are still lots of half-buried tombstones, lots of piled up stones where bodies were moved, and so on, but there are also numerous big tombs, and the paths are kept clear. That's partly because the mother of the Wesleys, as in Methodism, is buried there, and the Wesleyan Museum and chapel is opposite it, and occasional visitors from American Methodists help pay for the upkeep. (Well, pre-Covid; it would be ironic if a plague burial ground became unkempt due to a plague). The museum and chapel are worth visiting too.
I don't know if the museum's open yet - their website seems to have been designed by someone who got all their skills on an introduction to web design course in 2013, which would fit with the way their tour guides have been every time I've visited. Extremely old and slightly rude people who loved their subject and talked about our lives as if we were visitors from the future, rather than the present.
Anyway... Bunhill Fields was originally founded as a cemetery in 1665, in the plague, and the owner allowed anyone to be buried there - it was full of non-conformists of any faith. So if you go there, a lot of those unknown people with half-readable names on their stones were probably fighting to be different when they were alive, same as we are now.
(Sorry, I really love that cemetery and the museum and everything in the area).