Well I put a new battery in to see if the electrical issue would go away. I cleared the codes before putting in the battery for fresh start. Unfortunately even after fitting the battery I got a check engine light while driving and codes:P0306; P1314, and P1000.
I just hope the misfire in cylinder 6 is due to a faulty coil pack and not something more serious. Gonna book her in to get the cylinder 6 coil pack replaced as a first measure and see what happens. I won't drive her anymore - will trailer her to the repairer to avoid doing more damage.

 

Or move 6 to 2 front accessible cylinder because the 2, 4, 6 are towards the front bumper and easier to get at and see if the fault moves there, then you know...

 

+1 for Dell's suggestion, get the suspect coil and spark plug to cylinder 2 where you can remove it easily.

I chased random cylinder misfires for a year (but only about 1k miles) before finding out they were all related to failing fuel pump. In the end I got 6 new coils and plugs and new wires and a new fuel pump. The road to get there was painful but the car runs great since then. My point is don't assume when the computer tells you there is a misfire on cylinder X that it is that simple that you can isolate cylinder X.

 

I don't have the tools, garage or inclination to work on the car myself - I am getting the repairer to do it.

Regarding the fault possibly being the fuel pump - I think that is unlikely in my case as I reset the codes and got the SAME cylinder (6) misfiring again. If it was fuel related I would expect other cylinders to also be affected and not the same cylinder continually. I'll keep it in mind though as a remote possibility.