You must have more kit than white goods and appliances added together !!!! A nearly 6 metre shelf? That's got to be one entire wall, surely! I got fed p with accessing the rear of kit on virtually all wall shelves and made a 3 shelf ply unit about 1.5 m affixed to one wall but 18 to 20 " away from the wall, so I can walk behind all of my kit. As much of it (5 pieces) is delicately balance on three cones or suchlike, it obviates the necessity to move the kit at all.
Re. your supplies, I'm now totally confused. You affirm 'spurs' yet surely, what you have are (separate) radials, each terminating at the c.u. separately. Yes, you could have a spur off a radial (as you don't have ring mains) but I suspect that you have no need to do this. A spur can only emanate from an existing circuit, by definition.