Just to clear any misunderstanding, I have just watched the Video on You Tube(aka the old version), but it still explains the SID and STARs, which was very good BTW.
So, to answer my own questions
1. No PF3 does not need to know about AIRAC
2. You can fly how ever you want, either with charts or not, yes it takes a little effort and understanding, but it's not rocket science.
3. Yes it will use NATS as it will already be in your FP.
Conclusion it looks good and adds a slightly different way to fly with ATC, AND can be educational as you have to read the charts to get the most out of it.
You fly the SID and approaches as you would in the real world.
Overall I will get to like it, be prepared for more questions though
Thanks
Clive