Let's assume that the New Territories were ceded to Britain in perpetuity (either at the same time as Hong Kong Island or later), instead of having the lease.
Would the PRC have tolerated the entire area to stay with Britain even if the PRC had no legal right to it? I'm guessing PRC would have demanded it back anyway and just relied on the treaty being "unequal". I don't see an indigenous independence movement developing given a giant Communist neighbor clamoring for annexation. And up until very recently, I can't imagine a plebiscite resulting in a merger with China (and the UK wouldn't have even allowed this like in OTL).
So my guess is HK would have fallen, violently and humiliatingly for the UK, and probably earlier than 1997. UK-Chinese relations would have been damaged in a similar way to Portuguese-Indian relations after Goa fell. The UN wouldn't even say it's illegal, because it's China. No special relationship with mainland China, but probably not a vastly different situation than OTL. Unless I'm missing something.
Would the PRC have tolerated the entire area to stay with Britain even if the PRC had no legal right to it? I'm guessing PRC would have demanded it back anyway and just relied on the treaty being "unequal". I don't see an indigenous independence movement developing given a giant Communist neighbor clamoring for annexation. And up until very recently, I can't imagine a plebiscite resulting in a merger with China (and the UK wouldn't have even allowed this like in OTL).
So my guess is HK would have fallen, violently and humiliatingly for the UK, and probably earlier than 1997. UK-Chinese relations would have been damaged in a similar way to Portuguese-Indian relations after Goa fell. The UN wouldn't even say it's illegal, because it's China. No special relationship with mainland China, but probably not a vastly different situation than OTL. Unless I'm missing something.