Anyone else had this problem with a Fabia? We've had a lot of rain recently... :(

Not an expert, but heres a few suggestions.

Do you park on a hill? In my old car (Ford Ka) the airvent intake would let rain through and make a puddle in the footwell if parked facing up a hill. It was a design Fault. It may also be because the air intake's drain pipe has got full of leafs and debris so rain water can drain out and then overflows in to the car.

If not check that there is no grommits that has come out of the bulkhead and that it isn't leaking through the door seal, this is quite common on the rears.