Just picking a random set of dates in September/October....
DUB-DXB-CPT is $9143 RT in F. BA, for what it's worth, is $4092 through LHR and JNB with J on the DUB-LHR and JNB-CPT flights. (I know BA F is not EK F.)
AMS-DXB-CPT is $7771 RT in F. ($4096 on BA.)
CDG-DXB-CPT is $8487 RT in F. ($3820 on BA.)
BRU-DXB-CPT is $7610 RT in F.
LGW-DXB-CPT is $8940 RT in F. LHR-DXB-CPT is $8989. BA through JNB is $6327.
You get the idea. There's a pretty wide range of F fares in cities around London, and you might prefer to fly a cheap Avios ticket from London to that city and fly in F from there. You can also fly BA in F for much cheaper, but you obviously will get a significantly diminished experience.