I put my blue tinted spes on and saw a sparrow
However I respotted the Solitary Wave plaque.
If you trundle along Hermiston House Road and then access the canal (I take the west ramp to maximise sparrow/kingfisher potential spotting) you go under the hermiston house road bridge. However the plaque is on the west side of the next old bridge towards town about 75 yards to the east, which is actually a bridge to a boarded up road that would take you to the front door or back door more likes of Hermiston House. See Weir of Hermiston by Robert Louis stevenson or Weird of Hermiston (I think Jack Bruce rather than John Martyn) - see also Something to Live For which is a beautiful Jack Bruce song on his How's Tricks album.
Anyway the plaque says - Near this spot in 1834 John Scott Russell observed the Solitary Wave