You might be lucky, and the winner might post it on here. Alternatively, give TfL a call tomorrow.
As for remembering it in future: that’s a tough one. I’m surprised you didn’t spot it as you looked for the green light. Maybe just make it part of your routine: when leaving – saddle and bell. When docking: green light and basket.
And I saw the helicopter go through the bridge. Three times! Incredible.