I was going to give you my solution, which I posted to my own blog site a week ago, but I was told "you are not allowed to post links within the first week of signing up and must have posted 5 other posts first".
Anyway, it's only the second Inquisitor I've ever solved (with a bit of help from this thread) and it was knackering! #1644 wasn't too bad but if they're all like this I'm giving up.