Many moons ago they used to fly Singapore - Istanbul - Manchester , I dont think that was daily .
They are constantly winning awards for their service, I have only flown regionally with them IE Manila - SIN, SIN - Hong Kong and cannot fault there service. You should be able to stop-over longer than 1 nt (subject to ticket rules). Not sure if people know if you do have longer connection flights you can take a free Singapore city tour either daytime or nighttime (not both) that is airport, back to airport this operates at various times each day, need to show onward boarding pass (with any airline and time constraints)
I think the price in Sept is excellent for them. I may look into this for the eldest lad.