I took the opportunity to run at lunchtime. I used my normal loop and added a smaller section on the end. I just measured it using Mapmyrun.com and it tallied 12.1kms. The time was 48:51 so that's 4:02/km. Happy with the pace.
There's another race on this weekend. It's a 10km and I have to say I'm tempted. My plan is to try and string together some 80km+ weeks now for the next 4 weeks and do the odd race here and there to see where I'm at. It's about 2 months now until the half so still plenty of time to string some decent training together.