A few tweaks of the CSS on TRIP and it works rather well on the iPhone (and Android phones – thanks @amcunningham). See below for some screen shots. The top image is how the icon looks on the start page of the iPhone, below that is the top of the results page and right at the bottom is the bottom of the results page.
As well as looking great it makes TRIP usable on smartphones which is becoming an increasingly important ‘market’.
NOTE: @amcunningham has commented that the pictures are potentially mis-leading. To be clear, what I’ve described is not an ‘app’ it’s simply our site optimised for web-browsing. The top top image shows a bookmarked TRIP icon that takes you to the homepage.