Brilliant. Thanks guys. Definitely a useful thing to have by the sounds of it! I have a tiny drip coming in from around the bulkhead on the driver's side. Can't quite find it. Hardly anything comes in when washing the car, but over time it has built up a little in the footwell.
The leak is probably coming in from the grommets on the scuttle. A wee thin smear of silicon in the groove of the grommet usually cures it