I found this one, not sure which of the Red Funnel ferries it is, maybe a sister ship to the Red Eagle
(http://imageshack.us)
Just up the river, at the entrance to Southampton you can spot another Red Eagle sister, maybe even the Red Eagle itself:
(http://imageshack.us)
Then, even further up the river to Southampton, you can see a third Red Funnel ferry.
(http://imageshack.us)
Then, strangely there is a fourth one. The only possible explanation is that the images were taken at different times then joined together.
(http://imageshack.us)
However, i can't find the Red Jet 4 on Google Earth. Maybe these images were taken before the Red Jets launch in 2002/3?