Hi 3___________T,
I use the Durex Ring for "The Real Thing" every time, so I was interested regarding the supply:
In Germany I can still get it in shops easily. I didn't check for a while because I have some spares.
... and these things last long! On the box it says "replace after 6 usages", mine lasted more than xxx times.
So, I checked for you on Amazon w/ shipment to UK: no problem, just search for "Durex Ring".
How do you use it?
I always place it "above everything" = including my balls, and I have excellent results!
Had to use two rings for 15 Months but for some time now just one does the trick.
Good luck!
Cheers, Henrik