You are very fortunate to be training with Graham Morris, he is a very good sensei. Graham & my sensei both trained under Chiba sensei in England & share that crisp no non-sense style.
Everyone has offered you good advise regarding seize & dizziness durring Ukemi, so I will offer you the Data base you are after it is on the QLD Aikikai website.
as for etiquette you would do best to talk to the senior students in your dojo for advise to your particular brand of etiquette.
Good luck with your training.