I've got a rain leak - whenever there's a heavy downpour, the driver's side footwell is soaked - there's no sign of where it's coming in and the seat's completely dry so it doesn't seem to be the sunroof.

Any ideas? (Tempra 1.9 TD SW)

Hi ,
no specific idea,
check all the drains are clear in the scuttle( wiper-motor area)that's common to most cars,
itit definately rain water..happens while parked + NOT losing coolant,
Charlie

I had the same problem when I forgot to put back the plastic cover over the blower intake! Check if yours is in place!