I think it is the same/similar to the Jet2 FlightPath. We received emails to complete Aon test yesterday morning and are required to complete by for Monday - maybe this contributes to your delay. We also must complete a Motivational Assessment on HireVue but I think you are not required to do this?
For information, PilotAptitudeTest has the Aon 'Work-Related Behaviour' test in a simulator and 'English Language Comprehension' which is not available on PilotAssessments.