I remember it wasn't that long ago either...
Can't you just ask for diet Coke instead? Coke is vile imho. Far too sweet. I watched a video of someone burning off the liquid and the amount of sugary syrup left at the bottom of the pan is incredible. Appreciate the sugar content is high but for those who like it, if consumed in sensible amounts, its perfectly acceptable. Parents should control what their kids consume anyway and besides don't people brush their teeth anymore???
this isnt a greene king offer, its a coca cola offer, last year a local pub "the Warwick Street Social" was on the list, i went in, and all they had was Pepsi on postmix pump. Greene King just seem to be one of the biggest participants.
They'd sell their own grand mother for a bit more publicity.