Wow. What a race. Huge field, big crowds, well marked out route. I managed to get PRs for every distance between 400m and 10k, coming in just over 1:06 (1:05:32 for 10k according to Strava) and with a 0:31:17 5k in there. Loved it. Pushed hard throughout - my heart rate was well up.
It did feel like a lot of logistics for running 10k so I think I might stick to HMs for future races.