That filler lid used to seep a bit on our AUA for the exact reason mentioned (and easily fixed with a new lid), although I've never seen liquid oil cascading onto the exhaust heat shield like that - if it was that loose I would have expected the OP to mention repeated engine lights and error codes relating to air ingress?
Oil pressure switch leakage caused a dribble of oil down the front of the engine on ours but that was to the right of this area and I doubt it would spray sideways that violently.
Try giving that area a damn good clean and see if you can track the leakage sequentially back to where it is coming from.
Is it actually oil or just something that has burned onto the heat-shield surface after dripping through that now looks like oil due to caramelisation - could it be something leaking through the bonnet air intake area (looking at the drip marks in the middle)?