If you go here(smartcockpit web site)
A319 320 321 Flight Controls and select the Flight Controls choice, you should get a downloadable .pdf with descriptions of the flight controls. Please note the caveats. Starting about page/slide 58 the extended coverage of the priority choices begins. If that doesn't answer your questions, it may help you refine the questions you do have.
If you have already taken a look there, or have an up to date manual as reference, apologies.
Have you considered inquiring whether or not you could observe an A320 simulator session at a training facility through your university? Not sure how things like that work in the UK, but you may be able to get a look at how it works during a sim session if your university has contacts in the industry.
Best of luck to you.