Thanks all, that's some helpful input. I enjoy the setup I have, for the times I get to properly sit down and listen... I think I'll stick with it whilst it all is still working therefore before looking to rationalise!
I have an old hifi setup that I gradually evolved over the years since 1999 when I first purchased it for playing CDs. It now is:
B&W 601 S2 speakers on stands
NAD C350 integrated amp
NAD C270 power amp (bi-amped doing the low frequencies)
Pioneer N-30AE music streamer (replacing the Marantz...