Grey Seal in the River Ouse

I recieved a sighting of a seal (the observer said it looked like a grey seal) in the river Ouse near Southease, East Sussex ! The observer, Kirsty, was walking her dogs and the seal suddenly appeared in the water and watched them with interest before slowly floating away backwards (whilst still looking at us) downstream, then disappeared underwater.

Grey seals are not often observed in Sussex waters, so this is an interesting observation.