Yes, that was a video featuring Matthew Smith himself and quite a bit of Manic Miner too. Exciting, huh? Well, I'm excited. Very. Anyway. For further truths regarding this quite mysterious legend, oh beloved ZX Spectrum fanatics, click here, whereas to begin watching the man talk at the CG Expo try this linky link or to further practice your reading skills try the reddoor.
Related @ Gnome's Lair: the Jet Set Willy patch, RGCD, Monty's Christmas Special, Lurking Horror retro review