I have a complimentary Heathrow Express business upgrade code which I won't be using. The code is SEP16-90L15. Can whomever uses it, reply here to confirm that it has indeed been used. Thanks! Terms and conditions Complimentary Business First upgrade code valid only when purchasing a ticket on heathrowexpress.com or using the Heathrow Express mobile app. Code must be redeemed by 30th November 2016. One code per customer.