Yeah - Fresca was grapefruit .... and, if memory serves, Tango in "those days" also came in grapefruit flavour ! (unless I am going senile).
Very weirdly, this quite upset me because 1981 was my O level year - at which I did well - and it all seems to have gone downhill since then ! Kinda proves that they captured the essence of 1981 well enough for me to get all maudlin and nostalgic about it just from clothes and music etc.
I liked the juxtaposition of "Vienna" and "Shaddup Your Face" ........ even 27 (27 !!) years on, I still get riled about the travesty that kept Ultravox off the top of the charts !