In 1996, TVB remade their 1980 classic THE BUND as an updated version called ONCE UPON A TIME IN SHANGHAI. Aside from remakes of Jin Yong/Gu Long wuxia novels adaptations, it's extremely rare for TVB to remake or do follow ups to their older series (they'll do sequels for recent popular series, but I've never known them to make sequels to old classics from the 70s or 80s). So far OUATIS is the only example of this.
If you could remake or make a sequel to an old 70s or 80s TVB classic series, which one would it be? How would you do it? Would you do it with new actors, or try to bring back the original actors (in some cases, such as with Chow Yun Fat, who is now an international film star...or actors who have since passed away, it might be impossible).