My personal biggest from the Don has been 23lb and I have had 3 of that size from Parkhill. I have lost a couple of bigger fish, one very large one which I played for 3/4 of an hour before it fell off.
My dad has had a 28lb and a 32 lb salmon, both within the last ten years or so, again from Parkhill.
I have also seen a cast of one caught by my father's old doctor, caught in Seaton hole which weighed 45lb I think. I believe the cast is hanging in a fishing tackle shop in Edinburgh now.