Whoosh.
My £90 SR Black fuse has arrived.
Blimey, the improvement is not subtle.
Putting the old fuse back and the improvements in image focus and presence, resolution, and the sheer improved organisation of the soundstage went away.
SR Black back in - and improvements back as well.
This is one refund option that will most certainly not be taken up!
It's supposed to 'run in', well maybe, I'll see.
I've placed the fuse in the wall plug that feeds a mains block that feeds the whole system.
Where next for my next one .... ?
Thanks Gaz, good spot.