I am in a dilemma of using an Evoucher as its expiry date coming closer. I am planning to book a reward flight for 4 of us using avios+cash options, is it possible to use this Evoucher to contribute towards cash on this flight? If not, would it be possible to split 3 of us and 1 infant: use avios+cash for 3 of us and use Evoucher for infant (at least to use some part of it). Thank you for suggestions.