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In an offer run in conjunction with BA, Heathrow Airport loyalty scheme Heathrow Rewards is currently offering double points on your next 10 transactions.
The offer is valid until 31 March 2016, and apparently only applies to spend in Terminals 3 and 5 (i.e. the terminals served by British Airways), but I wouldn’t be at all surprised if the double points will be added for all your Heathrow Airport shopping, regardless of terminal.
To benefit from the bonus, you do need to register here.
If you haven’t already joined, Heathrow Rewards is well worth signing up to. You ordinarily earn 1 point per £1 spent at Heathrow Airport (including the official parking and Heathrow Express), which can then be converted to vouchers or loyalty points (Avios, Miles&More, Etihad Guest, Emirates Skywards and Virgin Flying Club).
In addition, the loyalty point conversions are fairly regularly boosted, often by as much as 100%. If you bank some double points in the above promo, then redeem them for double air miles, you’re doing pretty well!