Not only is P+ only on sale for end March onward, but for SFO-LHR they’re only for sale on the 77W.

Last week's SFO-LHR flights were on 772 and several of them (including my UA930 on 12/20) got Polaris/P+ swaps. Those in rows 20-22 therefore got P+ seats but were still in Economy/E+. OP and I may have been on the same flight; I tried out a couple of P+ seats for a couple of minutes at the start of boarding (very nice they are) before returning to my Polaris seat 15L.

I suspect a delay in returning the miles/copay due to the holidays. I passed 150K PQM on that flight and as of yesterday my additional GPUs hadn’t been credited. I’m giving it a couple more days before calling in.