Just an update on this,
I knew my gut was right, only 3 out of 6 of my glow plugs were working! 😮🤦♂️ So I've had them changed for new bosh components.
On top of that the battery was only working at 55% capacity!
I also had the glow plug relay changed for peace of mind, but keeping the old one as a spare on the road trips.
Needless to say my A6 is all ready for her adventure this weekend. More to follow in that once I'm back 😉