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Is it this crash you mean, or another?
Much more serious, of course.
It's obviously not really close to Aldwych, but your description of the scene sounds a bit like it. This one was in Clerkenwell Road, but very close to the junction with Theobald's Road.
https://www.lfgss.com/conversations/287607/
(Irrespective of which crash it was, it's generally not a good idea to rely on what police/other onlookers tell you about a crash at the scene, or rely on general hearsay. I've made that mistake myself.)
just saw a big mess in Theobald's Road, close to Aldwich. (around 10:30)
bike underneath a car (Uber, I'm guessing), the whole cross taped and packed with police. asked kindly about the rider and was told it was carried to St. Thomas with minor injuries.
seemed serious, but apparently it wasn't that bad. either way, hope for quick recovery of the rider.
be safe.