P2 is a new data centre built in 2014 on a former UK Ministry of Defence site. It's still surrounded by the MOD, and close to a bunker that was once supposed to house the Government in the event of nuclear war.
We are currently waiting for Ark to get back to us with the data centre specifications. Here's what we think they're going to say:
P2 stands for Phase 2. Phase 1 was when they built data hall P1.