Quick update - I have been off the forum for a little while however I am still unfortunately chasing the idle issue. I picked up a camshaft position sensor and changed it over after finding where the camshaft position sensor bank 1 was located but that didn't resolve the issue. Btw they are a nightmare to get out without breaking it in the block but WD40 over a couple of days and lots of wiggling did the job.
Then, I had the car for a quick diagnosis but mainly tuning with Matt from Kido Tuning (really lifted the performance of the car) and awesome bloke to deal with. He thought that it could have been the O2 sensor from live data, so I bought a new genuine O2 sensor that I swapped in during the week but the car is still running rough.
I'm sure Matt would have picked up if fuel pressure was an issue, so I have parked that assumption for now.
I have also tried injector and engine cleaner as well just as part of maintenance and service of the car but no results. Any suggestions?
The car will be back in at URD next week for another look. Tony has been awesome and is very trustworthy IMO when it comes to diagnosis. I'll ask him for a log this time around so that I can post it on here.
Thanks for all the input - much appreciated!