Bit overly sweet and simple - so I left out the sugarvand added 4 drops of Difgord’s Marguarita bitters (counterintuitive, but they work) and it cheered it up no end.
Thanks, Sally. I agree - I've removed the sugar syrup and added bitters, but I used the pineapple and mint flavours of our Daiquiri Bitters. I also added a few enhancing drops of saline.