Seek and you will find.

A spot to rival any on a Welsh river and full of trout to boot. I took five fish, all about half a pound (bar one at the full pound) one after the other on dry fly from this pool.
Key point; it's a fifteen minute drive from my house as opposed to the two-hours-plus of the upper Usk.
The only downside is a shitload of Himalayan Balsam doing what it does and taking over from native riparian vegetation.