Hi Snazy, it was your post number 16 I was referring to. It would be nice if we have a "hotline" of sorts to the police because this activity only takes place when Honour Oak gets very backed up. Turn up at any other time and it is very rare for people to go the wrong way down it. Monday night was a perfect example, took my daughter to Guides and at 6:30 pm a white Mitsubishi 4X4 decided he couldn't wait so down he went. Was to far away to get a registration and driving so couldn't use my camera.
I quite like your croc teeth suggestion (my thinking was more along a Claymore!!!) but auto bollards are expensive.
The camera idea is a good one but sadly it doesnt work. There is one by the Horniman school but parents still park on the zig zigs.