BA 269 (LHR - LAX) turnback

[bnt]

I just happened to be on FR24, looking at flights to LAX, and saw BA 269 (https://uk.flightaware.com/live/flight/BAW269) turned back to LHR about an hour after takeoff. It has landed OK and doesn't look like an emergency, but I'm curious whether anyone heard any reason for the turnback?

[bnt]

One passenger on Twitter says it was a medical situation involving the copilot, with an ambulance crew meeting the plane at the gate.

[am111]

Was on frequency when details were given. Captain was incapacitated with severe abdominal pain. Hope he’s okay?