The most recent Streetview shot shows that this place is now occupied by a (surprise surprise) jewellery shop. If anyone can remember what Millie's used to sell, please let me know in the comments.
There is also an earlier bit of the same scene that looks to have been filmed further along the road towards the junction with Temple Street because it looks as though the Liberty Theatre can be seen in the background (showing Rocky!) which puts the filming year of The Heroin Busters firmly in 1977 (Rocky was released in HK on May 19th, 1977).
