Aquarius sounds like a custom job however from the picture I would swear that is Typhoon which is a genuine monogram paint (and also the most expensive one too). This is one of the best monogram colours looking purple, blue or green (or combinations of all 3) depending on the light.
I'd love an MG in that colour! The best colour since Amaranth IMO.
The cast iron way to tell is to get the paint/trim code off the vehicle plate I think and if it indicates Typhoon it is unlikely the ZS has been resprayed another colour because it costs around ÂŁ1800 as an option!
Anthony.