To be fair, the airspace was designed when there were 2 Dash 7s a day there (and they usually had an airmiss around OCK!).
Things have certainly changed at LCY since then - with around 6400 movements in Feb, it is busier than a lot of other H24 airports!
I have formed an escape committee now Mike - the next time you visit you may see me shuffling around dropping earth out of my trouser legs as the tunnelling is well underway!!! 