Some of the cars are named wrong in the video, the redbull isnt the rb1 i think its the rb5. And im 99% sure the MGP W01 is actuially the brawn gp car painted like a Mercedes.
Yeh the Mercedes F1 car was the Brawn GP car in Mercedes livery.
I believe it was actually the RB1 that was being driven. Thats what the commentators said on the day anyway.