Long story short. Bought two for £32 a pop from Green Man Gaming against what I thought was trade in. They messed up and charged my card the full amount. Selling on here instead of returning to GMG as I don't trust them to handle the refund.
Hoping to lose as little money as possible, so after £30 per card if I sell on here.
Payment via BT/PPG
Codes to be e-mailed upon payment, as I'd prefer not to faff about posting them.