I was quite excited to finally use a voucher - I'm not sure why, but the latest ones were entitled "BA American Express Premium Plus Companion Voucher", and seemed to have more seats available.

Anyway, I booked BA to Vancouver in September, but the only business outbound option (for weeks either side) was from GTW, and therefore not club suite (plus it's harder for me to get to). I booked anyway because I could get Club Suite return into LHR.

Now I'd like a way to keep an eye or more availability coming up specifically for that voucher type, and change the outbound to LHR if possible, but without such a voucher left on my account, I have no idea how.

Is it just a case of manually phoning in, with no way to do it online?