I notice it's been some time since I did any kind of update on here.
The C6 has seen more service over christmas and has developed an annoying little trait, apparently I have a puncture on the NSF, no worries, off I trot to the tyre shop, who quickley tell me that there's no puncture, it's a leaky valve.
and this is where the fun begins, "we'll just tighten it up" being the kind of chap I am I feel it's prudent to mention at this point that the car is fitted with sensors "Ah!" says young boyo "I'll get the boss" and off he goes...
Boss comes out "Right then, let's have a shufftie"

"He's right the valve is leaking, I'll just give it a quick nip up" out comes the socket set, nut duly tightened, water placed on valve, and YES, it's worse than before.

Boss man "How very strange" (or words to that effect) "'I'll loosen it back off" this is duly done and the leak stops..........
fast forward 20 minutes and wheel is now refitted and the warning has gone. Drive up the road,

all is well again. Pull into my drive and yes the the warning comes on again.
I'm now thinking along the lines of a faulty sensor............ Thankfully I managed to acquire a couple towards the end of last year for a fraction of the normal cost.