UC seats SFO-LHR-SFO

I'm looking for guidance to research a problem. I have been a serious Virgin Atlantic lover for at least twenty years. I always loved everything about a flight on VS. However, the last couple of trips between SFO and London have featured seats that do not have variable recline. You sit up a little reclined or you lay flat. Neither of these is what I want. I want to put my seat in EXACTLY the position I want, just like the olden days. Every FA or Purser I've discussed this with understands exactly why I'm unhappy, so this is not just a self-absorbed issue. I've been flying other airlines for the past couple of years. I've heard that VS is bringing on new planes and am hoping things improve. I am perfectly willing to fly out of LAX or Vegas but of course would rather have a comfy seat out of SFO. How do I find out about the UC seats on these Virgin flights? My next trip is November 2020 and I'd surely like to book with Virgin.