This is all but the first few songs of the Gateshead concert put on by MikuUK (or 'UK39' as they now prefer to be called), video-ed from within the (somewhat chatty at times) audience. Yes, the focus drifts from time to time, but it gives a good idea of how it went.
Actually, for a fan-based vocaloid concert, it's quite good, and some is really good. Rin and Len at the start are rendered extremely clearly, brightly, and do have a three-dimensional appearance that is getting on for as good as one gets at the official events.
The motion is generally good quality, if a little unambitious much of the time (these aren't the 'official' motions for these songs) and in a couple of numbers Miku appears to be rollerblading (that 'sliding feet syndrome' I have discussed before), but overall it's a good effort. More motion capture would make a world of difference, rather than trying to create motions by bone manipulation(!)
The live band is welcome, and are quite good, though unsurprisingly not in the league of the now-legendary 39s who performed at several of the big concerts in Japan in 2011 and (I think) early 2012. The sound mix is nearly always excellent, unusually well done, I'd say. It is clear that the whole team has put a lot of hard and dedicated work into their events, in fact, breaking new ground for us here in the UK.
Anyway, here's 35 minutes of the Gateshead event, which I hope you'll enjoy despite the technical issues of focus and audience chat in places...