I have seen the documentary of the making of the cake and they really did do it - but I want to know what they did with it afterwards? Hope they didn't waste it!
The makers of this advert unfortunately couldn't eat the cake as it took several days to make and was under hot studio lights.
Certain parts of the cake, the windscreen wipers, and chocolate speedometer, for example have been taken by members of the crew as souvenirs, while the rest of the cake is to be made into compost. So all is not wasted. :)