[MENTION=738887]Anonba[/MENTION] made a typo mistake in their post. If you take a FTV in exchange for cancelling a 2-4-1 voucher it is valid until 30 Sep 2023. All future travel vouchers are valid for travel completed by this date. The only downsides to a FTV containing a 2-4-1 are that it ties in the passengers and it can only be used by phoning BA to book, you lose the ability to do a booking online.