New Amex statement credit offer: £10 off £35+ Heathrow Express spend

American Express has brought back an outstanding deal: get a £10 statement credit for spending £35 or more at heathrowexpress.com by 29 January 2019: 

Hold an Amex-issued card (Gold, Platinum, SPG, Nectar, BA, ...)? Check your account now to see if you have been targeted. I currently have the offer on my Gold card, but not on the Platinum account.

Note that only online transactions qualify. Valid once per card only.

This should stack with cashback (see TopCashback), and with the ongoing 12% discount if booked via this link: How to get a 12% discount on Heathrow Express tickets every time.

Full terms and conditions:

• "Spend must be billed to your Card account by 29/1/2019, to be eligible for this offer. If Heathrow Express does not charge your Card during this period, e.g. because of a delay in dispatching your goods, you may not be eligible for this offer.

• Available online at www.heathrowexpress.com.

• Only one credit per UK Card.

• Offer only applies to spend made in Great British Pound (GBP) on the Card to which the offer is saved, including an American Express Card loaded into a mobile payment wallet.

• Offer does not apply to spend on other Cards you might hold and is not valid for transactions made using Payment Aggregators.

• An awarded credit may be reversed if qualifying transaction is refunded or cancelled.

• Credit should appear on your billing statement within 5 days from qualifying spend but may take up to 90 days from 29/1/2019.

• For full Offer Terms and more details about statement credits click here.

• By saving the offer to your Card, you agree to the Offer Terms."