I doubt there will be a container from Holland to Ireland.
It's only about 5-6 hours pure driving, not counting time spent on ferries.
The ferries are also the biggest hurdle since the fares in the middle of summer are not that cheap.
Dermot: what do you think is the most economical/convenient way to get to Ireland?
Hmm I must be missing something. Google has this as a 16 hour trip. Even if you're spending 6 hours on ferries...
https://maps.google.com/maps?q=holl...HtUfOJHbjH4APBnoHIBw&ved=0CAoQ_AUoAg