As PilotsOfTheCaribbean said really.
It's still a relaxed and friendly affair, but with a couple of groups of questions. If I remember correctly it was something like a few "give me an example.." questions, a few tech questions (pretty basic stuff) and few "how would you..." questions.
Holdpool?? Guys have been interviewing this week and last week for a course in late April, no holdpool as far as I'm aware.