It looked like a mobile phone mast going on top of one of the buildings near the Salisbury (I was in a car in the middle of Green Lanes so hard to see)
Love all three answers so far, though I'm sadly more swayed by Michael's. A Harringay bungee jump or our own pop art obelisk hold out more personal appeal though.
Nodding donkeys, now there's a thought. One each side of the newly tarted up Harringay Bridge, so you can pop in your local annual taxes; chewed, digested & results out the other end. Maybe one donkey representing council spending and the other the current government.
Looking for petrol? Maybe there are some anxieties in some quarters that people in Harringay are a little too keen to explore renewable energies. Or maybe they fear that the war in Lybia might not bring as much petrol as they thought?
We walked past there yesterday and it looked like a crane taking something over the top of the building next to Tescos. Sorry mine is by far the most boring reply ;o)