In general we recommend that a consultant supervisor is nominated to oversee your project. This helps to formalize the project and in particular facilitates your application for ethics approval. The consultant supervisor will need to provide a summary of his CV for this purpose.
In some situations, ethics approval for a study may be given to a chief investigator who is not a consultant. The applicant will need to provide evidence that they can act in this capacity (e.g. by demonstrating previous experience in research particularly as a chief or principle investigator).