Hi All

Got a 5-week jaunt to JNB from MEX via LHR. Used a GUF2 for it. We thinking of shortening it one week due to some work commitments. Was wondering how I can search for availability as we booked it using WTP avios for CW seats, not cash. What's the simplest way to know if we can move the date of return forward a week? I don't have another voucher, so can't see it in the Avios portal by pricing up a new ticket.

Thanks in adv