By Ken Foxe (@kenfoxe)

This is an interactive video to guide you through our special investigation into political expenses. As you watch, you can click through to official documents and interviews, without leaving the video.

The video may not work with all browsers and works best on modern up to date browsers such as Chrome, Safari, Firefox and Internet Explorer 11 on desktop and tablet.

The format is compatible with most Android smartphones but will play without interactivity on iPhones.

Tell us what you think about this new storytelling format, powered by TouchCast, by emailing yourphotos@rte.ie.