Ok, all sorted now.
So now I have precat - CAT - centre silencer / resonator - straight pipe - tips.
And it sounds great. Silent when bumbling around in D, sporty but not over the top when in Manual mode with the paddles. Popping and banging on upshifts and downshifts in M or S mode. Completely silent in N (great for freewheeling down my hill at 2am in the morning on the way back from a night out without annoying my neighbours).
So for anyone else considering;
Removing resonator alone = a bit of nice drone on boost, vvvvv slightly louder at all other times. Not really worth it IMO and probably sounds like a resonated Milltek.
Removing resonator and backbox = TOO LOUD. OTT. Worried about Police pulling you, sounds epic in tunnels, gives you headache and temporary tinnitus on any long journey.
Removing backbox only - sounds good, a mellow slight drone, probably like an unresonated Milltek. Costs around £150 and your choice of exhaust tip(s). Also you get stainless tips as apposed to standard mild steel / rust magnet ones. A bit of a jekyll and Hide exhaust if you have S-Tronic as it shifts before its resonant frequency (around 2.5krpm).
Next: Pre-cat delete + Apr carbon airbox. Remap, resonated downpipe with high flow cat and uprated DV next year.