Planetary Nebulae (Pne) are a relatively rare but powerful late-stage stellar population in terms of what we can learn about stellar evolution and the chemical enrichment process of entire Galaxies. Their ionised shells exhibit numerous and strong emission lines over a wide range of the electromagnetic spectrum. As such they represent highly useful “laboratories” for studying the plasma physics of these celestial objects.  Because most radiation from PNe is emitted via their strong emission lines they can be found to enormous distances outside of our own Galaxy. Their rich variety of lines also enables estimation of elemental abundances, expansion velocity of the nebula and associated kinematic age. HASH (Hong Kong/AAO/Strasbourg H-alpha PN catalogue) is a PNe mutliwavelength database of all currently known Galactic and Magellanic Cloud PNe. It has provided a powerful online resource for the global community to study both PNe and their CSPN with over 1100 users in more than 60 countries.

In this talk I will present some key, recent results from various HKU based projects on PNe facilitated via our ESO VLT data and HASH. I will cover a recent, enigmatic 5-sigma PNe alignment result in the Galactic centre, our robust abundance determinations and resolution of a decades old  so-called “sulphur anomaly” problem.