Welcome to the forum.
I think the first step to take is to read this in the FAQ re. Naim Amps and speaker cable;
If NACA5 is too much of a stretch for you cost-wise then look at cables similar to the older NACA4; Linn K20 is a popular choice. You also have similar figure eight construction cables like Cable Talk (IIRC currently being sold as Talk 6?). Be sure that you use Naim SA8 speaker connector at both ends, properly soldered. If in doubt, I’m sure your Naim dealer could supply the plugs and solder them for you.