Cadland Creek is just north west of the Fawley terminal on the west side of Soton Water. I went in there last Sat, on a 4.5m HW; as far as I know, no Parkers/Seals have been in there before.
Although there was plenty of water, there's not much else to recommend it - unless you are particularly interested in the petrochemical industry!
This is what it looks like in Google Earth:
And from the boat:
Geoff
Parker 21 / 18 Dawn