I looked at the power cable nest next to the side of the desk this 
morning and tutted. So many cables that had been there for so long, 
with many now actually being redundant. But this is the "problem" with 
owning lots of Raspberry Pi's - each one needs an USB power cable, and 
while I had a bigger stack of them it made sense to try and use just 
one PSU for the whole lot.

So I bought an Anker 6-way USB PSU and fed that from the UPS. It's 
been so reliable I haven't looked back, and as I replaced the Pi's 
with other computers (NUC actually) I just unplugged the "hot" end of 
the USB cables I didn't need. Anyone who's seen my desk will 
understand why... Anyways, I now have just 2 Pi's running off the 
original micro-USB cables, with the others requiring the beefier 
Official Pi wall-plug style PSU with captive cables. 

The good news was that I was able to shift the desk over, just enough 
to be able to snip cable ties and recover the rat's nest of wiring. 
This has now been consigned to my spares box and the much-reduced Pi 
stack is now back up and running happily.

Next job is to pull the desk right out, clean behind the damned thing 
and do a proper, accessible, *final* wiring job. That'll happen before 
Xmas and will not be before time!