The fiesta is bad for this and alot of folk think it door/light rubber seals but its not .
The problem is a gap in the FRONT innner wing under the plastic wheel arch guards .you have to remove your wheel ,remove the plastic guard and locate the gap/hole near the rear of the inner wing ,prob has water dripping out of it then fill this with exspanding foam ,once you have done this you will have to open you bonnet and trim back where all the foam has came out in the engine bay .Once you have done this put the plastic arch guard back replace you wheel and you car will never leak there again and dry feet .This should have been a recall by ford and it affects a lot of these cars and one of the main reasons whay we have had a lot of changes to the ford feista in the last 5 years ,not that ford would tell you that .
Dave
December 2008