We went again tonight and drove a little further along from car park 1( the one that 02 are charging 20.00 to park miles away from the arena). 2nd turning on the right.to come across a car park thats a pay and display. we paid 6.00 to park right next to the arena. we think it was called car park 2. you can park there till 11.59 pm. Not sure what they do after this. but there is a barrier there.
Dont get more ripped off from the o2.

It's the car park for North Greenwich Station. You can only park til midnight then they ticket you - so beware.