Noted following in Transport Canada occurrence reports for May 19:
Due to an unruly passenger, a British Airways Boeing 747 400 (BAW274), from Las Vegas (KLAS), NV, to London (EGLL), UK, requested to change its destination to Montréal (CYUL), QC. BAW274 landed without incident at 0857Z and with no impact on the operation.
If you are looking for peace and quiet, LHR-LAS appears to be a flight to avoid