Don't waste your time on legal action on this iphone app. Yes, notify Apple and publicize it. But, your energy is better spent innovating and hacking. While screen-scraping is hard work it doesn't bring success and other good programmers can re-implement your work without stealing it. Hell, this might be a good opportunity to open source your screen scraper. Publicize it so that others will collaborate on improving it. Then you can focus on more interesting work. Data gathering is hard work, more people doing it make it easier.

What can you do with your app that isn't so easily stolen (and reproduced) and turned into a carbon copy? As you've already seen, public transit apps are a dime a dozen. How about a bigger/better itinerary application that includes trains, planes, and automobile times so that one can put an itinerary together of vacation travel across all of Ireland? Add hotel info, confirmation info, etc, etc, etc...

I don't have the links handy put there have been other articles on HN about lessons from stolen work. Big lesson: it rarely matters because the people stealing ideas and work don't have the skillset to do it themselves. In the long term they can't compete with the new features and directions that you'll go.

What I'm trying to say is, use that energy from your anger to create something fcking awesome that that stupid muppet won't be able to compete with.

* I'm from the US. Yesterday, I learned about the use of the word muppet over on that side of the pond. BRILLIANT!