Oh, Aickman has been on the get list from the very start, be assured. Hopefully, I'll soon be dedicating some time to rights queries again and we'll see what we see.
With Aickman, I see three potential problems:
Rights - the usual difficulties, nothing specific to him.
Length - this would depend on the story, of course, but he tended to write long.
Density and Ambiguity - at least as an audience consideration. Aickman strikes me as sharing the potential roadblocks for audio presentation with Henry James - his text is just so *dense* with meaning that properly processing it in audio may be difficult for the listener (I remember telling Dave a couple of years ago that it took me a third reading of "The Stains" before I caught the subtly buried hints of the narrator's alcohol problems). And then, ambiguity - while Aickman's crowning achievement in creepy effect writing - tends not to go over very well with some listeners. But that hasn't stopped me before...
If feasible, the best to choose from would be legion but "The Swords" certainly leaps to mind as an engaging and horrific masterpiece, although "Marriage" and "Larger Than Oneself" are also personal faves.
I'd also love to run "Three Miles Up" by his associate, Elizabeth Jane Howard.