Hi Clive,
The filter is by the right rear wheel. My problem turned out to be a faulty sender unit at the bottom of the filter. If you unscrew the sender unit if you have any water it should come out. If you do this and the light comes on then disconect the cables and this will stop the engime managment sysytem from cutting off the engine and go to the dealer to be pluged into the system. I hope this helps.
David