I happened to have a look at DUR fares today, and noticed that along with the publication of the new schedule, new fares were filed. There are some distinct reductions for travel that starts on or after 29 October 2018. A £400 reduction in ex-UK I class base fares together with the reduction in TFC from flying the non-stops rather than connecting via JNB means that the total ex-UK I class price will reduce by close to £500.