Serious question though, which I've asked before, but not seen an answer to:

When I made a time change to a previous booking, where charges had gone UP since the original booking, the fare was recalculated and we had to pay the difference. So... would the reverse happen, if I changed the time of a domestic leg, connecting to a long haul flight? And seeing as we booked during the 50% miles sale, would original mileage still apply? Or am I asking to have my cake and eat it?!