Help! C5 S6 has dumped all its coolant :(
 

Looks like I am going to have to be recovered home... The car has dumped all its coolant. First I knew of it was when the warning light went off on the dash. Temp gauge was fine. Steam everywhere, stopped the car, opened the bonnet, looks like the top left of the engine is wet somehow (standing at the front looking into the bay) and when refilling the reservoir the level just drains from the off.

I've not had the car a week so it's a bit disappointing although I knew a car of this age would have various jobs needing doing. Does anyone have any ideas what might be at fault? Is there a hose there that could have perished?