Given that the SL SRP is £2899 and the NVC-TT is £2699, ignoring the power supply permutations for now, it is disappointing (and strange, as I would expect that Naim know what they are doing) to hear that the new phono (~13 year newer design) is not performing at, at least, a similar level. Honestly, when Solstice came out, and based on what I had seen, I was expecting the NVC-TT to be a replacement for StageLine. Obiously that role has now been given to the built-in phono preamps, which makes total sense.
It is also annoying that the innards of the NVC-TT and the NPX-TT haven’t been shared either with any high resolution photos. Really curious to see what is inside 
.
Edit: Actually a high-resolution photo of the NVC-TT is here:
NPX-TT still missing 