Gawd bless you sir, I have taken your advice. Just for once in my life I have sold a share at the price I planned to, rather than sitting back, eyes bulging with greed, while the SP does a smart U turn and heads south again.
You never know....
After watching Rio's SP spend most of the day heading happily south, I finally bought in at 2840 at around 3 pm. Whereupon the price managed a modest (very) rise. Rocal might be onto something.