If Oggy decides its too far to come now, John is a maybe cause of his car being in doc and Choptop isn't up for it anyway, so that only leaves about 2 or 3 of us.
You need to check that its an 06MY and not a 2005MY registered in 2006. If its the 2006MY it will have the led rear lights, 2 slat grill and the later interior.
A bit more info for you in answer to some of your questions.
Extended warranties are available but I'm not sure of the cost. Also the original RAC breakdown/recovery which is only for 12 months is extendable (mine cost £144 to extend for 2 years).
If the car has a Bose system check the CD player for skipping. Earlier cars also had an appetite for front tyres, so check for uneven wear.
Big Phil is up North and can probably advise on tuning establishments in your area. Possibly also Dan. May be worth sending them a pm.
Enjoy your search.
OK Dumbly here you go
You can stay with 5w 40 or use 5w 30 which is what I use.
I think what you have is semi synthetic but is doesn't matter as you can mix it anyway.
Check it when its cold and add a smallish amount at a time. As a guide, when on the min mark it will take 1 ltr to bring it up to the max.