The keycaps were apparently an off-the-peg design, from a Scandinavian firm iirc. Dickinson did use them nicely, in the QL, the Spectrum+ and Spectrum 128 and also in unused designs like the wafer-scale-integration-based QL https://www.flickr.com/photos/9574086@N02/830029700/in/album... and the Pandora laptop https://www.flickr.com/photos/9574086@N02/829341753/in/album... . (Those two appeared in Delete: A Design History of Computer Vapourware https://www.bloomsbury.com/uk/delete-9780857853479/ )

They look nice but they're the same as on the + and the toastrack 128K and incredibly awful to type on - keys rub against each other and don't depress evenly.