A number of F1 drivers will take part in this weekend's Race of Champions in London's Olympic Stadium, with over a quarter of the grid signing up for the event. Jenson Button goes up against David Coulthard in the ROC Nations Cup on Friday before racing Felipe Massa in the individual event on Saturday. Daniel Ricciardo will take on Nico Hulkenberg in another all-F1 battle, but on Thursday they all just got to test the cars and had some big smiles on their faces after sliding around a very wet track...