Originally Posted by
Raffles
….... I can't believe I need to call up to do this.
Ha!
According to the main thread for all things 2-4-1 you can usually do this
https://www.flyertalk.com/forum/brit...iscussion.html
Q: I want to use two vouchers at the same time for four people to travel together. Can I book this on ba.com?
A: Yes. If you are holding two valid vouchers earned using a Premium Plus card, you can use two vouchers to book for four people travelling together (including yourself), paying the Avios for two people and the taxes, fees and charges for four. If you want to book this on ba.com, you must check for availability for four passengers.