Worryingly, the two most recent cabs I've bought, a Big E 45 and Phil Jones C4, don't have the impedance marked anywhere. I presume they're 8 ohms.
No worries, Mike. Mine's one of the early ones so so logos no labels and I know it's an 8. But PJ? Surely every cab should be labelled; we shouldn't have to dive for the manual, especially when the after-market comes into play.