Couple of questions on these DVD sets.

I got the series 1-5 set from the Amazon UK and noticed that individual series stop at 6, with 7 due in March.

Flick over to Amazon.com, and the 6-10 set is available and also a stack of individual "volumes". So is the 6-10 set actually Series 6-10, or "Volumes 6-10"? At a glance the volumes appear to be a bunch of episodes rather than a complete series, as they go up to #14 or so?
Seems really weird that these aren't all out in the UK yet.

I took the plunge and bought this. For anyone who was curious, they are indeed the "Volumes" rather than "Series"... but all the episodes from Series 6-10 are there, in proper order, just not all on the 1 disc - eg Vol 10 has the last 2 episodes of Series 7 and the first 4 of Series 8. Kind of confusing, but at least it is complete :)