All FTVs were extended - see here:
https://www.britishairways.com/en-gb...uchers-refunds
If you have an existing voucher with an expiry date prior to 30 September 2023, please note that your voucher will automatically be extended to 30 September 2023. Customers will be notified with new voucher details as soon as possible.
Amex 241 vouchers which had been issued were extended, and some achieved last year were issued with a 30 month validity. I'm not sure that another extension is likely. You should be able to see your current 241 vouchers and it should show the issue and expiry dates. Under 'more voucher information' you should be able to see used and expired vouchers and the same data.