The University defines collusion as a 'form of cheating which occurs when people work together in a deceitful way to develop a submission for an assessment which has been restricted to individual effort'. This means that you have worked together on a task, that you were instructed to do by yourself. You are allowed to get help from Peer Learning Advisors or other University teaching staff.
The policy also states that avoiding unauthorised collaboration is a student's responsibility. Students must "produce assignments independently, except when they are asked to participate in a group project requiring a joint group response to a task".