Ghosts don't show-up on photos, usually
I have had a lifelong uninterest concerning the subject of ghosts. I don't actively dislike, but am unmoved by ghost stories, and stories about ghosts.
I am happy to acknowledge that there are 'such things' as ghosts, since the credible eyewitness consensus of all times and cultures attest to their reality; but I haven't experienced ghosts (so far as I know) and don't bother trying to seek out such experiences.
Yet the British public are fascinated by ghosts; and belief in - and fear of, ghosts is widespread; including among people who are in other respects highly rationalist, atheistic types.
I lived for a year in Durham Castle, an extremely beautiful, ancient, and architecturally-multilayered set of buildings for which guided tours are given - and the guides reported that the single thing which most excited the guests was a story about a ghost seen around the sinister 17th century carved black oak staircase. This was what really gripped people. Yet the story seems to have been fabricated quite recently by a student guide trying to spice-up the tour experience (and maybe get a bigger tip?).
I once spent the night in this castle absolutely alone, among hundreds of empty rooms - and even the porter absent. The place was full of creaks and other noises, and I felt far more nervous and on-edge than I had anticipated. Yet it wasn't the possibility of ghosts that bothered me - although I'm not really sure what it was.
I once visited the old, rural house of a research scientist; and mentioned casually and jokily that it looked like 'the kind of place' that might be haunted. The next morning, this scientist came to work with hollow eyes and a haggard expression, having been awake all night worrying about ghosts - and very angry with me for having made that off-hand comment.
For many people, therefore, ghosts are a real possibility - whether exciting or sinister; including the Inklings. But not for me - at least not up to now. I'm a bit surprised by my 'blind-spot' on the subject of ghosts; but there it is...