The stuck fermentation would seem to indicate that the god-awful stench was caused by stressed yeast.
Call that the straw that broke the camel's back. It's history.
Thanks again everyone for your help!
Well it's too late now, though I'm thinking that to check for H2S, isn't that were you stir it with a length of clean (shiny) copper pipe ? and if there is H2S in it, then it reacts with the copper and some of the sulphide attaches to the copper and it goes green/black very quickly.......
I can't recall your original recipe, but when it comes to nitrogen requirements etc, I was asking about that over at
Gotmead some weeks back.
One of the best answers about that can be found
here it's author, WayneB is very knowledgeable on stuff like that, so it might be worth having at working out the requirements of your next batch his way first.....
Or of course, just google for the JAO/Joes Ancient Orange recipe and give that a go. If you haven't already tried it, it's nice and straight forward, if you stick to Joes exact recipe, it's hard to go wrong (and you also have the luxury of being able to use cheap "store bought" honey).
dunno if any of that is any help...
regards
fatbloke