Just for the record the trader is being most helpful and wants to resolve the issue, I just dont want to be seen to be slagging off the trader as I'm not at all. He called the garage and they said they noticed nothing out of the ordinary with the engine sound etc.
Just got back from local garage and both mechanics who I know and trust said it didn't sound anything serious at all, he recommended making sure its got a decent filter in and getting the besrt oil I can as you can never be sure what oil was put it in by a garage.
Then took it to Nissan over the road who this mechanic knows the service manager. He came out and also said he didn't think it was anything to worry about, then another mechanic pulled in, in a 350z, we popped the bonnet and it didn't tick like mine but they all seem to sound a little tappy, ticky as most engines do.
Anyway, this mechanic listened to it and said he's heard that sound from 350z's before and its more than likely a sticky lifter? He also recommended ensuring decent oil and filter and then keep an eye on it but I had it from seperate mechanics that it wasn't anything to worry about and in fairness they all said they wouldn't have noticed the sound if the car came in to them for a service.
The sound does seem to slightly come and go or at least go up and down in terms of volume.
Mainly Mark and Alex (I value your opinions and I appreciate a video isn't the easiest way to diagnose) but if there is anything you would like to add or strongly disagree with then do please let me know.
Really appreciate everyones help on this, reminds me what a great community this is