Keep a beady eye on this folks.
The two drain tubes that exit under the car (near the ABS modulator bracket on the LHS and the steering column UJ on the RHS) cause rust on the
upper surface of the metal around the holes.
Here's the LH tube - I've pulled it out of the hole to show the problem.
The rubber tubes themselves are clear of debris btw so something funny is going on.
More pics later.