AFAIK, what the police police, and what the ADR's require, are 2 completly different things... Farked up? Yes...
So, if your going 1km over the speed limit, then technically you can be fined... In reality though, this doesn't happen... My feeling is that Ben was in the 100 zone, and as silly as the whole issue is, being booked for 18 over is par for the course... If he was in the 110 zone, then I'd put it down to the Easter Blitz, double demerits, and those new blue cars we all paid for...