For some reason I don't see the image on Gumtree, but the price seems to be decent compared to
other '08 1.4 Corollas on AutoTrader. I'm unsure what the exact spec differences would be between Professional/Advanced/Sprinter models though. That being said, is this the previous generation Corolla we're talking about?
The AA test is unlikely to bring to light any prior accident damage, unless it was very poorly repaired. That test is meant only to discern whether a car is fit for use or not.
As for the car in general: it'll likely get you where you want to go with clockwork reliability, but it won't ever do much more than that. Toyotas, by and large, are commuting appliances - if that's all you're looking for, then so be it. Just don't expect stellar economy, as it's a fairly sizeable car with a wheezy 1.4l motor...