Heathrow Rewards has added Etihad as its latest airline partner.
The move means members of the airport's loyalty scheme can now transfer their points to the Gulf carrier's Etihad Guest frequent flyer programme.
Heathrow Rewards allows members to earn one point for every pound spent at an airport retailer, on car parking or on online Heathrow Express bookings. Foreign currency exchanges earn one point per £10 exchanged.
Once 250 points have been earned these can be converted into 250 Etihad Guest miles. Members can continue to convert in multiples of 250.
Until June 30, members will receive double miles on transferring Heathrow Rewards points to Etihad Guest miles.