No idea how I managed it but I did. Wanted to walk (really wanted to walk) from about half way . I did get incredibly hot, it's the first run I have done since its been a bit warmer so guess I will have to wear a cooler top. Didn't help that i had a waterproof on, as usual at the moment. Even though it was awful I did maintain 6 min km for the first 4 k, speed only went to pot in the last one. Here's hoping my graduation run is more enjoyable as certainly didn't find the zone before, during or after that run.