Okay, so after trying a couple of different ways to flavour my Huel, I decided to try something that someone suggested earlier.
Cocoa + orange extract. Amazing. I tried just the cocoa alone previously, which was nice but not as nice as with the orange extract. This is with vanilla Huel, by the way.
A couple of others and I have tried matcha powder. I tried it with the Vanilla, and I remember it being a very mild but pleasant taste - probably just around a teaspoon (same amount Iād use for the tea). Just maybe a bit expensive to use as an additive for Huel (for me anyway).