Just booked for end of March:
LAX-ZRH LX F
ZRH-LHR LX C
I was (happily) surprised that the agent found this - asked for LAX-LHR, and I knew that for my date only LAX-DEN-ORD-LHR (UA F/C/F) was available after spending a lot of time looking for a better connection on ANA. Still I would change it for a direct UA F or NZ C flight if a seat becomes available.
Around £115 in tax. Only 10 minutes on the phone ^