'Cause it's the cyclists that need educating...

I disagree. PO vans are often driven so aggressively I'd rather hang back where this picture was taken from.

For serious? It's your right to be at the front in the funny green box. What's Mr. Postman gonna do, drive straight over you? He can wait as far as I'm concerned... In a few feet he'll be able to overtake you if the road is open...

Look again boys, the PO van is indicating left....

The riders need to be in front of it, or behind it taking the lane.

He won't be overtaking that noddy on the inside, he'll be turning into him and frustratingly trying to complete his maneuver whilst waiting for the scramble of kerb hugging lemmings to realise he's turning left.