According to this the obstacles were installed late, among other things: http://www.cyclingweekly.co.uk/news/latest-news/rapha-super-cross-organisation-criticised-after-event-cancellation-199907?utm_source=Twitter&utm_medium=Social
there was a lot of hammering still being done (to some pretty flimsy-looking obstacles) when I rolled up at 11. Maybe Imperial College next year and some engineering students?
@Matt started
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According to this the obstacles were installed late, among other things:
http://www.cyclingweekly.co.uk/news/latest-news/rapha-super-cross-organisation-criticised-after-event-cancellation-199907?utm_source=Twitter&utm_medium=Social