Thank you for your feedback! It's a fun route, and certainly adds a new dimension to the Goyden experience. Fortunately, it's one I no longer need now that I have a brand new ankle and can get along the main river passage again.
I can't remember a T-Junction where one leaves Carbide Tin Passage to emerge at the base of the 20' climb, and there isn't one marked on the
survey. It gets low and aqueous after the step-up for a few metres, and there is an obscure connection with a pit descending from the Worm Drive after about five metres on the left (not marked on the survey), so maybe it's that you're referring to.
However, I will try to make it clearer that one should be specifically looking for a
"hole up to the right before the passage degenerates, marked by a pile of shingle at the base".
It's a pity that your mate didn't fancy the step across, as once in the continuing passage and through a wriggle, the way eases, and only three minutes to New Stream Passage.
I'm pleased that you seem to have found the route back to Five Ways Chamber, because that connecting passage is a little intimidating if you don't know where you're going. When I first did it, I had a colleague guiding me from the far end!