dissolve in cold water, ONLY THEN add hot water. The rationale behind it is that aromatics evaporate too quickly when the instant powder is infused with too/boiling hot water.
It's a bit more common in the UK. Everybody's got 230v electric kettles practically in every room (/s) so having coffee that just takes hot water has extra appeal. I'm also lead to believe that their instant coffee is a bit better quality than what is common in the US.
this is so odd for me to read. instant coffee is treated like literal dirt over here. so the idea theres a good kind of drinkable dirt sounds hilarious.