I emailed the graduate admissions office and had this back:
"The final decision-making deadline for departments in your admissions cycle was last Friday, March 20; you will be notified of the outcome of your application shortly via post. If you do not receive a letter regarding your application in the week commencing March 23 and urgently require a decision, we would recommend that you contact your department directly via e-mail. Please note that the Graduate Admissions office is not authorised to disclose departmental decisions, and we do not currently offer online or e-mail notification for graduate applications. "
To email or wait for snail mail?