Join Date: Jul 2005
Location: London, ARN, HEL, ..... or MAN
Programs: BA GGL / GFL, Mucci Diamond!, HH Diamond, Radisson VIP, FB Gold, LH Sen, Hertz Gold
Posts: 6,481
Hi Charlyonge, and welcome to the forum!
I have called BA before to request extensions to various things. My experience has been that BA can extend the vouchers which they control (Gold Upgrade Vouchers etc.), but they can't extend Amex vouchers.
I would recommend you try Amex first as they are the ones who issue the voucher you need extending.