Well after a series of trades, I picked this up today from a very strange dealership in Manchester, which takes up a whole upstairs factory floor.
So it's an Overwater Perception Custom Classic made in 2006. The main differences from the Inspiration/Progress series is that the older basses have the pickups further back towards the bridge & closer together, producing quite the punch in the mids department, not unlike a rampaging horde of angry Stingrays. I particularly liked the Rosewood on Mahogany spec as it reminds me of my first Status bass which I bought in 1990.
After putting on some new Elixirs and adjusting the truss rod, the only issue is that despite the string height being just about perfect from frets 1-7, the huge brass blocks on the bridge don't allow the strings to go low enough between frets 12 & 24. I'll call Overwater tomorrow and see if they have any smaller string blocks for these old bridges, and visit my tech to see if the string grooves on the E & B blocks can be widened/deepened.