If you've never visited this fabulous reserve, you don't know what you're missing: rare Acros aside, it's a lovely place, with decent hides, good walks along the Hen & Blyth estuaries and lots of the 'bread and butter' birds in all seasons.
Actually, the first creatures that caused me to click the shutter was a small shoal of large (5kg+) Grey Mullet cruising up the narrow channel by the path.
Just past the third hide (a walk of around 1.5 miles, according to my Fitbit!) we came across half a dozen birders looking at / listening to the target bird. Now I've probably seen ten Marsh Warblers in the UK, but never as well as this! For ten minutes or more, it perched high up in the reeds: although somewhat distant - perhaps twenty yards - it allowed good views and reasonable photos: two proper photographers, with better gear than I, will have good some fabulous shots!
Other interest came in the form of a couple of Red Kites and a few Little Egrets. Great stuff!