Originally Posted by
swgsword
If flying non-rev, you won't be able to get in the UC solely based on United status. As mentioned above, you can still use your United Club membership if you have one. Alternatively, if you have *G from another *A airline and scan that card first, you'll be allowed in as well.
You are correct if this was on a domestic itinerary.
However, since OP is based out of LHR, their international travel would allow them to have access to the UC, assuming the question is related to LHR-US travel solely.