I was trying to get a 2-4-1 CW LHR to JNB for November this year, I tried in January but there was nothing. There was plenty of availability in this class to North and South America (both East and West coasts in the US) but we plumped for UVF instead
and cost was c£750 in fees and taxes between two. Not bad in my eyes but would've preferred the 11 hour overnight flight to JNB again for Kruger Park (everyone should go there at least once their life!). I guess the Caribbean will have to do instead.