Having been guilty of a couple of mis-id's myself recently (and only just recovering from the shame) id can be tricky, especially for the optimist. I think it is easy to forget that the majority of people perhaps only get one trip out a week and so their exposure to even common birds is quite limited. Yes, they do need to have a go at id themselves but even then they may not even realise the group a bird belongs to or rarity. The female snowy-browed was not a million miles out by the illustration in the Viney book. Maybe we can create a dichotomous key to first eliminate stonechat before a post is allowed! :-)
I think an ID section is valuable but agree with Jonathan that an exclusively HK section would be a good addition.
Dylan