"I am uncertain about the specific services performed prior to purchasing the vehicle from Sytner."
It is likely that insufficient effort was expended, since merchants often do the minimal necessary to sell old inventory.
It may have had an oil change, oil filter replacement, and air filter replacement, but likely not much more.
This inevitably brings up the contentious issue of the seven-year warranty.
If it was sold with an active warranty and you paid a premium for this condition, ensure you possess an updated document of proper service under the Kia schedule.
Kia is stringent on this matter and will reject any warranty claims for service issues not addressed promptly.
They have also been known to advocate for any other things, even if they are not serviceable, despite the fact that non-serviceable objects are intended to be covered anyway. An instance of this might be an ECU or a door actuator, which is often anticipated to last for 7 years without maintenance.