How could you have a traction problem slowing for a junction? Were you braking and felt ABS? How can you say it absolutely wasn't road conditions? You inspected that piece of road after driving over it?That's the problem, I can't reproduce it at will and to be honest, I hadn't really considered it was TC.
I've had it slowing for a junction (almost at a crawl), pulling out of my drive and one other time I can't remember what I was doing. I wouldn't class either of those as situations where I would expect traction problems based on the conditions.
It felt like something 'skipped' and IIRC it was the back nearside wheel every time, so I was concerned something mechanical was starting to give way!