Gosh, that was quick!
Thank you everyone, that is very encouraging. I will make no hasty decisions.
Yes, I have contacted the finders, I THINK my descriptions are ok, modified slightly after each contact. I also had my parents actually follow the instructions without trouble. They're not cachers, but keep an eye on the cache for me on request, so they did have the unfair advantage of knowing where it was!
I'll email the DNF cacher and ask whether particular problems.
Chris, that's very useful, thank you. I have amended the description (2D is indeed 2xD, what other interpretation could any rational being have? Oh, wait, we're talking cachers... ) and waypoint names. I think that will be helpful too, hadn't thought of that.
About to add a checksum, good idea.
Thanks again
Russell