It would help if you posted when you want to travel. There may be availability if you look. For example this search gives you J to LHR but not to CPT on SA Airlines.
[KVS Availability Tool 5.1.2/Platinum - SNT: Awards/StarAlliance/JP-ANA]
Code:
YYZ Toronto Pearson Int'l ON CA [CYYZ]
CPT Cape Town Int'l ZA [FACT]
TUE 02 Mar 2010 | 1 Seat
Carrier Flight From Depart To Arrive A/C Availability
--------- ------ ---- -------- ---- -------- --- -- -------------
AC 858 YYZ 23:05 LHR 11:15 +1 763 FS/ CS+ YS+
-> SA 221 LHR 20:15 +1 Cape 10:25 +2 342 FS/ CS- YS+
AC 876 YYZ 22:00 FRA 11:50 +1 763 FS/ CS- YS-
-> LH 576 FRA 22:55 +1 Cape 11:20 +2 346 FS- CS- YS-