Likely final update from me on this for anyone that was following - I just picked up the Nait2 this morning - looking beautiful and pristine.
Source-wise, to start with I'll just be feeding it with a Chromecast Audio via a Chord Mojo. Turntable to come in the future, and maybe a cd/better digital streamer/storage system further down the line.
On the speaker front, as much as I could have been ok with my current speakers for a while, I found a pair of Audio Note AX2s for £250 on ebay so decided to pick them up to act as a stop gap until I can move on to auditioning a few different higher end options (if I feel like I need to) - it seemed like there were a few different threads here that mentioned the Nait 2 and AX2s were a good pairing.
Thanks all for the valuable input.