Water gets in, down through pollen filter housing and drips in to footwell ?

have you recently changed the pollen filter

Clean out all the muck at the back of the bonnet in the dips each side where leaves etc gather, there should be a drain each side.

and, from talkford

open up the bonnet, and check where the hinge area is on the drivers side, look to the left and there is a small seam that is not filled up correctly, the water runs into that, fills the pillar with water flooding your car with water.