So, we hurried downstream to Erith (part of the so-called, 'Patch'): where much, although not all, of the Mud had also been covered by the Incoming Tide.
Birds seen on the Thames' Foreshore:
Great Black-Backed Gulls
a Grey Heron
Lesser Black-Backed Gulls
Birds seen in the Grounds of the nearby Church of St John the Baptist included Redwings viz.
*** the Tide Timetables use British Summer Time (BST): not Greenwich Mean Time (GMT). Something we had vaguely suspected but hadn't checked on.