As South Wales isn't too far from Poole, I would recommend you book one of Emblem Sports Cars' Saturday morning clinics. The guys are very knowledgeable and a pleasure to deal with. They will tell you all about the car you've purchased, plug in the diagnostics and tell you if there's anything amiss. They'll also reset any error codes and if simple, fix anything there and then (relays etc). And, it's all for free. Of course, the idea is to get you interested in using them for your servicing etc but, there's no obligation. It's a couple of hours well spent.
Dave