AC,
Was on the Ythan estuary myself today. Fished from boat on the rising, full and falling tide and then to the bridge for the ebb. Mate had 3 sea trout, 1 1/2 lbs, 2 1/4 and 2 1/2, 2 on fly and 1 on spinner. I lost one of 2 lbs on a spinner. We also had plenty of small immature sea trout which were returned.
All in all a very good day but experience counts as my mate demonstrated!!
Well recommended but as Jim points out above, the tides are everything.
Lyall