It was a great event! I wasn't sure what to expect with no profile map on the website (could this be useful?) and so decided that once my pace up any of the hills got outside 11 min miles I would allow myself a short walk. That seemed to work and got me around in a good time (for me).
If people are browsing this next year, before deciding to sign up (as I did a few weeks ago) then be aware that this tactic may be worth a try. The hills are a lot shorter than those for instance at Snowdon, so you can do shorter walk breaks without eating drastically into your time.
The aid stations, marshalls and overall organisation were great. Well done to all involved!