Routegadget:
http://www.slow.routegadget.co.uk/rg2/#144&cou...Bit of a disaster - took it slowly and steadily to avoid mistakes; not only did this not really work very well, but I assumed other people would do the same, and they don't seem to have! Therefore I am well down the results.
Bit of a faff finding the trees in the park at the beginning - but that was proper night-o which I am very bad at. Then some very confusing three-level mapping to rival the barbican.
Good fun but felt like a novelty event to me; if you'd run there before or even been there before you would have a tremendous advantage.