Instructions:Got this code after email sign up. Code is not account specific so will work for everyone. Not sure when they will pull it hence no end date.
Full terms from email:
1. The YEMZAXR promo code is only available at Heathrow Flightpath and Heathrow Hilton for bookings made before midnight 22/04/2017 (ha ha, still works)
2. This offer applies to new bookings only and cannot be applied retrospectively to existing booking.
3. This offer can be withdrawn without notice.
3. Limited offer and subject to availability.
4. Only one entry and one exit is permitted.
5.Both car park and pre-book NCP terms and conditions apply.