Although I cannot claim to have known Dudley well personally, I well recall visiting his shop in Golders Green before he moved it to the much more convenient Farringdon Road. In the early 1970s for a time there was a huge 8-inch Cooke refractor which somehow had been set up as a window display. I am told it was eventually bought by someone in Saudi Arabia. Later I used just such an instrument at Cambridge and was able to appreciate how good an 8-inch OG can be. I also recall buying an eyepiece holder from Dudley in the mid-1970s and getting him to take it out the back to machine it to fit a flat tube instead of a curved one. He was very quick on the lathe!