Motorshow at Excel - Parking?

[police state]

Does anyone know about the motor show's park n ride scheme?

We're going to the 'Rock in the Dock' concert after the motor show, does anyone know where the park n ride pick-up point is?, did you take your car?

are there alternatives to the organisers 'park n ride' scheme?. There appears to be very little in the way of useful information their website...