In reply to All
Thanks for the help. I think it's a bit of a lottery, not helped by the jackals being available in both 9.5 (sold out) and “9.5+“.
A quick look at my shoe rack gives:
Nike UK 9, EU 44
Salomon UK 9.5, EU 44
La Sportiva UK 9.5, EU 43.5 (although the akyras are bigger than the boulder x in the same size 🙄)
I've taken a punt on the 9.5+, I've only lost £3 in return postage if they dont fit.