They didn't run a real selection process. It was just a personal questionnaire online and a quick phone interview with the hiring agency (Resourse Group). No technical questions, nor HR related. Just a few questions about my passport to make sure I have no traveling restrictions. Thus, I'm not surprised if some didn't even make it to the line check. My start date would have been 2nd August.
Because of this, at the time it seemed a bit dodgy to me and since I was almost toward the end of the selection process with my current employer, I quickly turned it down.