They're VERY big on safety, so make sure you over emphasise that. Take a look at their website and as there are lots of info on their core principles. You won't go wrong if you mention them. And, give examples if you can of any experience you've had that touches on these principles.
They have huge ambitions ( right now they have 90% of LHR T1 Ramp ) and that will grow even more, so talking about their vision for the future will also help.
Worthwhile knowing about the senior team as well - who they are, where they've come from etc.
But again, safety, safety and safety are their priorities.
Good luck....