It is annoying, though. I've been puzzling for the best part of an hour. In future I shall studiously ignore any request for help if I see the phrase, "Sorry, no letters".
DT 27664: it's a very boring puzzle. Can I now proceed with main aim of the evening (mine to know and you to guess)? (Wife's gone to bed. I've kicked the cats. Done last night's Missing, and suffered consequent madness. But Arsenal have won!)