discoloured coolant

[mat glew]

Just got back from a drive and noticed that the coolant in my header tank is discoloured towards the bottom of the tank.

I'm kinda thinking that this is the dreaded head gasket failure..

There are no other symptoms that I can see....no coolant loss and no mayoinaise under the cap.

2 questions I guess...is it likely to be HGF and is it safe to drive to a garage or should I call out direct line to take me there (its about a 40 min drive).