Is there any idea of the writers outside the ghost story world and I guess fairly confirmed names like Thomas Mann that influenced Aickman? He seemed to have a pretty wide cultural knowledge and vocabulary so just wondered if there was any idea of other influences
An interesting question. I am pretty sure he was very well read (catholic and eclectic) and had a large library. I have long seen evidence, as you say, that he was influenced by Thomas Mann in his fiction. And we actually have the hard evidence of what he chose for his eight Fontana Antholgies — my consideration of these in detail here:
The Fontana Great Ghost Stories chosen by Robert Aickman — he chose what he saw as ghost stories to his own literary tastes but these writers were not all ghost story writers as such, but mainly general literary figures in his past and present.