I am planning to book a return soon (CPT-LHR/LGW in CW) calling at midnight.
In the very unlucky case in which someone else gets the seats on all 3 flights before me, I am planning to use JNB-LHR as a fallback option. When on the phone, should I try to get the Comair leg booked at the same time or is there a risk that, by asking for that, I'd delay the process, hence increasing the risk of losing the CW seats?