I would assume that if they all were shipped together, it would make sense to ship them to the place where the majority of buyers are?
If that was the case and it happened to be a long way down south, there could be extra costs for us northerners that could negate the need for bulk shipping in the first place. At least in my case.
I'm all up for saving coin, but if the costs involved in having it delivered or collecting it myself once its in the UK are close to just having it shipped direct to my door from Skit-B, then I would choose the latter.
This is a good point