pee_vee: To be honest I've not looked where it's leaking from properly yet, I was going to on Sunday but couldn't be arsed. It sounds as if the thermostat housing is a common point of failure, but different construction.
Alex: Passenger's footwell is nice and dry... my car rarely sees the rain and the AC is draining very well.. so much so I thought it was a problem! Although I'll be sure to check once I've done a long run in the height of summer (err... ok next time it's mildly warm)