Buying miles to MFU: is there a catch?
I think I have done the maths on this correctly:
A MEX-LHR-MEX tkt costs approx £770 more in CW than in WT+.
I could buy 13,000 miles from BA for £223 to MFU from WT+ to CW o/w.
This represents a saving of £162.
Am I missing anything?