Just to clarify, the mooring that I got via auction isn't in Nantwich, it's further north.
I had a mooring at Nantwich for a year or so about 2019 but never really used it. Seemed good value for money but just a bit too far away from home and where I wanted to be using the boat. I was another one of those absent boaters. Got a second CaRT mooring on the Macc when a decent shortish spot came up on buy now. Auction one is different location again.
As for demand, being in commuter distance of Manchester, waterside moorings around here seem to be released regularly but are then taken up quite swiftly. No moorings currently listed within 20 miles of Marple, but they do come up. It's easy enough to register an interest in certain locations and get email/SMS alerts when something is available.