I must admit I quite like the new A6, not as much as I like the 5 series though but none the less it's seems nice, I can imagine what it's like to drive though, most likely like most other Audi's, a bit bland but perfectly competent.
And yes the A7 is out in the UK, but there is a waiting list till about March for them if you were to try and buy one now, probably longer for the smaller engined ones everyone seems to want.
The interior on the new A6 and the A7 are basically the same from what I can tell and I must admit though I was a bit disapointed by the A7's ...it just feels a bit cheap, it lacks the premium feel of an A8 or the new 5 series. It looks nice in pictures but when you look a bit closer, it's not really that good tbh. Don't missunderstand me though, it's far from bad, and really depends what you compare it to, next to a Mondeo it's fantastic, next to it's direct rival the new 5 series, not so much ...and compared to want I am used to ....nope.