Sorry to hear about this Josephine. This absolutely does need reporting, regardless of whether you have the car/driver details - you would never know what medical complications might arise hours or days afterwards so an accident needs to be accounted for. If the time was noted there would be CCTV worth checking. As an occasional driver I wouldn't dream of leaving the scene without at the very least checking with the cyclist. And as a regular cyclist, I would hope that the operator of a vehicle would have the common decency to ask about my well-being. I read about the last fatality in Bow yesterday morning then cycled from HH to Wandsworth and back, and for the first time, felt very pleased to reach home again.