Vacuumed the car today, noticed a drip.....drip.....drip.... from the wheel arch area.
Checked all the levels and all fine. Then shone a torch into the area under the black plastic cover over the wiper mechanism.
The drivers side was full of water!
So, clips off, two small hex screws out, wipers unbolted and off.
Long screw driver to clear the hole, the water flooded out. Wiped up the excess and refitted all the bits.
Also checked the passenger side, all seemed dry and clear.
If anyone is going to do this, make sure you switch the car one, and use the wipers once (with them off the spindle). This makes sure that the spindles are correctly place when you drop the wiper arms back on.
Hope this helps anyone else with the same issue.