Can we start a list of current discount opportunites for the Heathrow Express (in addition to the ones listed on https://www.heathrowexpress.com/tickets-deals/discounts-deals?
I did find one if a Mastercard is used for online purchase:
https://www.priceless.com/en-gb/unitedkingdom/Heathrow-Express-Discount-UK/offer.html
Are there other discounts or promos available? I am most interested in the one-way fares.
Thanks.