I haven't done Henghist but I have my doubts about it. I have a vague memory of someone commenting adversely on it.
You could have a good day at the Chimney Pots by doing Soma Crack, then do John The Baptist to the first terrace. Rather than continue up the rather nasty top pitches, abseil down the hole to the descent downTwin Chimneys (or just descend Twin Chimneys from the gallery window without doing the short pitch to the first Terrace). That would be a good plan for a warm day as you'll be in the shade for the whole time.