Tempted by an S8

I very much love my S5 but got a bit of an itch to look at either an S6 (Saloon or Avant - although the latter are nearly as rare as hens teeth used) and then got to looking at the S8.

Seems to offer a lot bang for your money, particularly used, thinking of either a 2013 or 2014 one. Anything to watch out for? Downsides are most don't seem to come with Adaptive Cruise which I like on the S5 and the tech seems about the same as on my S5, whereas the S6 has the Phone Box/4G data. Neither of those are deal breakers. Do the matrix LEDs come as standard on 2014 models but not 2013 ones?

Is the V8T on the S8 the same as the S6/RS6 motor in an in-between tune? Presumably reasonably reliable?

What's the rear space and boot like, with a kid in a child seat in mind?

Any experience of the A or S8 much appreciated.

Hmm, interesting, I hadn't considered that, a quick look on AutoTrader turned up this example, that's a lot of car for the money. Frankly the options listed are almost slightly scary and I'm pretty sure I would actually lose my toddler back there!

Are all the W12's long wheel base?

Yep, some proper depreciation there! I doubt that there's that much more to fall (per year at least) some 2011 ones without as much kit still retail for just over £39k.

The W12 is LWB only and is probably a bit too much car, if that is such a thing!