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From your map, these are far up-river aren't they?
The back one looked so long that at first glance I thought they were vagrant bearded seals, but maybe not in a beck in Teeside!
OU Certificate in Contemporary Science
And I wasn't sure about them myself.
They are frequently seen at the barrage (about another 1.5km upstream), hunting for fish just below the turbulence. I long to see one trying out the refurbished kayaking course there!
They also swim a fair way up a side creek (Greatham) to some muddy flats there.
The mud even makes them the same colour as bearded seals!
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Lat/Lng: 54.57492739625, -1.263367657084
OS grid ref: NZ477202
Near confluence with the tidal Tees