For all other Ullysee owners with soggy carpets I think I've solved the problem. In desperation I took off the pollen filter covers, removed all three filters and then stuck a hosepipe in each hole. Not very technical but soon showed up a problem. Water soon gushed from my drainage hole (!) underneath the car roughly between both front seats so all OK there. I then noticed water coming from my front offside tyre and soon discovered a rubber hose behind the wheel sticking out and down. Hose had end tapered I assume to stop debris going up it. Checking nearside wheel housing I found same hose but totally dry. After some squeezing and with hose still on full, a gush of water pushed out whatever was blocking the tube and ran freely after that.It might be a good thing to check this annually especially if you have many trees near you like me.
Phew...lets hope thats the end of that.
Regards, VS