What was Bram Stoker's inspiration?

Philip Coppens believes he has the answer for the inspiration for the climatic scene in the original novel Dracula and the beginning scene of my work, The Mystery of the Haunted Vampire.

In London, Dracula tourism is mostly centred on Highgate Cemetery, in northern London. The cemetery is a labyrinth of graves, largely in the Victorian style. Many believe that the cemetery forms the backdrop for the climax of the novel. The scene involves the moment when friends of Westenra decide to stop her suffering as an undead. Her only crime was to fall in live with Count Dracul, which she paid for with her life, and an eternal life as a vampire. Her friends convene in a pub, Jack Straw’s Castle. The pub still exists, in Hampstead. From there, the friends decide to go to Lucy’s grave, to give her eternal rest.

This site is normally given as Highgate Cemetery, but research has shown that the voyage from Hampstead to Highgate does not correspond with the descriptions given in the book. Lucy’s tomb was placed in Hendon, not Highgate. In Hendon cemetery, there is a strange mausoleum, which perfectly fits the descriptions of Stoker’s novel. In reality, it is the tomb of Philip Rundall, a prominent member of Hendon’s community, who died in 1827. The cemetery was also one of the favourite places of one of Stoker’s best friends.