Many thanks from me too. I figured out the basic idea from the get-go, but having solved well over half of the clues cold, I was struggling to get my head around the extra letters for the fat/tall grid entries. Things are now a lot clearer. I'm fairly new to the Listener as well, and an occasional foot-up is a big help. I've still got a handful of clues to solve on this one, but hopefully they'll fall into place now. Even with all the misprinted letters, I must say that I'm not convinced by the name I have for below the grid though. Unless I'm missing some thematic connection, it seems a little odd.