Had a proper look at the water leak
Carpet is soaking in both front and rear footwells. Removed the door trim and found that the door membrane is half hanging off!
Also lifted the carpets and the underfelt is soaking to, looks like it could be coming in from the front of the car and running down. I have checked the large grommet and it appears to be in properly, can't see anything obvious on the Pollen filter housing but dont really know what I am looking for