Rad Header Tank 197

Can some one tell me how the header tank is attached. My one is free floating. Don't know how it happened, but I cant see were it fixes to. Thanks in advance.

Pete
 
iirc it is held by a plastic drive type of rivet - fitted through from the front of the car ie behind the grill...
 
Tanks for the info foxspeed. I take it that the whole front has to come off. Don't fancy paying out for the dealer to do it, is there a quick way?

Pete.