Like, A LOT. Trust me when I say, this is the best thing on UK TV at the moment. It is stressful just watching it, but that's only because of how engaging it is. The pace and camera work make you feel like you are there in the kitchen, being pulled back and forth between tasks. It reminded me greatly of my own work experiences.
The cast are incredible and their characters interesting.
It is not important to watch the short or movie versions that predate this series, as it stands perfectly well on its own. However I would highly recommend doing so as they too are incredible, and would help you avoid writing reviews stating that this has copied a show the original concept predates by 3.5 years.
My only complaint, wanted more episodes!