The most dangerous places may not be where the accidents happen because:I am very surprised that there is nothing around the Stratford gyratory.
1) Cyclists avoid them if possible (particularly the inexperienced)
2) The remaining (experienced?) cyclists tackle them very, very carefully
Its the places that look and feel safe but aren't that are the real danger.
You should also take into account that because of the small sample number the deaths will not be proportional to the risk at a particular place or time.