I was assigned row 20 for both SFO-LHR and LHR-SFO. I also looked at the 744 seatmaps on ba.com, and it looks like it's in J (although I'm in 20G on the return, which doesn't even exist according to BA). Does anyone have a seatmap of the config they're using on the SFO-LHR flights?

I booked through expedia.com, and I've been unable to pull up my itin via checkmytrip.com or ba.com. Is the 6-digit locator from expedia just an internal ID?