Since I last posted this 'Should've Seen This Year' list I've seen many Yellow Wagtail and a single Merlin. I still think I could get half of the remaining birds:
Lesser Spotted Woodpecker
Also, my year list is now at 174, and I think that my 200 target is very achievable - especially with a trip to Scilly in September. Now, I know that September isn't peak time, but since I'm still a relative novice it should give me a number of birds I've never seen before. For example I'd go bat crazy for a Red-backed Shrike or a Buff-breasted Sandpiper - both of which are quite likely.
I'm also conscious that my UK llife list it at 197. I wonder what the 200th will be?