BA cabin upgrade voucher one way or change class one way

[claytom3214]

I’m new to this forum and not used a Cabin Upgrade voucher before. I’m interested in using the voucher for a long haul flight. I can see business class availability to the destination but no business class coming back covering a few weeks. Can I use the upgrade voucher for 1 trip (outbound) and then use it again on another trip going outbound or book business class outbound and premium incoming? Thanks for any advice.

[NorthernLass]

You can use it in different cabins on one trip, not on 2 separate ones.

[AndrewT]

Or to upgrade two people outbound only.

You would need to call to book different cabins out and return.