OK...yes, it would be aerial work though I wouldn't be 'instructing' aeros, just finishing the sortie with a couple of manoeuvres
From the Trainingcom for which I provided the link earlier:
AEROBATICS ON TRAINING FLIGHTS
We would like to remind you that the inclusion of any aerobatic manoeuvres during training flights constitutes aerobatic instruction, whether these manoeuvres are part of the training syllabus and the intended lesson or not. An Instructor is exercising the privileges of his/her FI rating throughout a dual flight (including a trial lesson) and to carry out or demonstrate any aerobatic manoeuvre, therefore, requires that the Instructor's FI rating is not restricted for the purposes of giving aerobatic instruction.
So, you will need to remove the restriction...
Your DA [Display Authorisation] will get you a EASA AR [Aerobatic Rating], since you can demostrate that you have aerobatic experience.
In order to instruct aerobatics in the manner you describe, you must complete the FI course for removal of the 'No Aerobatics' restriction under the instruction of a FIC Instructor. Under EASA the requirements are similar in that in order to obtain an AI [Aerobatic Instructor] Rating you will have to demonstrate the ability to instruct this to a....FIC Instructor.
There will be a significant transition period for implementation of the Aerobatics Rating [2015ish]. Dunbar, I recommend that you do the job properly by completing the course, so that you can charge appropriately for your knowledge and experience.
ifitaint..