Anyhow: by 8.50 there was no sign, just lots of pre-roosting Marsh Harriers wheeling around in the murk. With the camera on 'night scene' and 3200 ISO, I took a couple of photos to check how grainy they'd be, then left for home. As I reached the junction of Sandy Path and Fen Hide path, I glanced right in time to see the Osprey flying west along the river, disappearing behind the scrub before I had a chance of a record shot. I ran towards the river ( well: waddled, really!) and picked the bird up distantly towards Tower Scrape: one shot was all I managed, because the camera kept hunting in and out of focus :(
Still: perhaps it'll summer in the valley, allowing everyone to get a decent view.