There were 4 ejections from RNZAF A4's, one downwind at Ohakea and the pilot suffered a broken leg, one near Castlepoint, one near Marton, and one in Australia. The last three without injury.
The only one that I can remember over the Firth of Thames was a RAAF F111, but that was a lot earlier than 1990 and IIRC the crew were unharmed.