Practise or Practice Driving Test

Hi I am in Australia but trying to use UK English rather than USA English. I am currently writing content for a Driving Instructor here in Brisbane. He offers driving lessons and at the end of the driving lessons students can take with him a practice driving test. The practice driving test is a 'mock' driving test. It is also part of the services that he offers, driving lessons, practise driving test, defensive driving lessons etc. I am not sure if it should be practice or practise. Here is an example from the website page that I am writing

The practice driving test lessons we conduct closely resemble the actual test that you will take on the day with your Driving Examiner. You are welcome to undertake as many practice driving tests as you feel necessary, to adequately prepare and feel confident in your abilities to pass.

The department of transport here in Brisbane uses practice rather than practise and an overwhelming number of people search for practice driving test rather than practise driving test. However the owner of the business wishes to use the grammatically correct word. Please can someone advise. Many thanks Karen