I am pretty sure that last time I checked this route demand was showing around 300/day (I wrote this down on a notepad). Now it's showing 0 demand!
Have you changed anything to the 'The Early Days' Game recently? Have I maybe spotted a bug here?
Plus I get ~150 demand on the YPPH-EGLL sector. Of course YPPH is a little closer to EGLL than YSSY is, but there should be more pax wanting to fly from YSSY to EGLL, I guess.