BA a running  a promo, for UK residents, earning 25% bonus Avios in Club/Business or First. Book between 20 July to 31 October and complete travel by 31 October, after you register for the promo.

This works for AA and BA flights as follows:

British Airways operated services to Los Angeles and New York, originating from London Heathrow Terminal 5 and London City, United Kingdom.

American Airlines services to Los Angeles and New York originating from London Heathrow, United Kingdom

Fares as follows:

Flights on British Airways in First and Club World, in selling classes (First: FA) Business: (JCDRI) on the routes listed in clause 4, are eligible as Qualifying Flights. All flight bookings are subject to availability. Flights on AA in First class and Business class, in selling classes (First: FAP) Business: (JDRI) on the routes listed.

There is a maximum of 4 qualifying flights. Domestic connecting flights are excluded.

Full terms and conditions and registration link is available via this web page.

Eligible Participants travelling long haul will be awarded a bonus of 25% extra Avios for one return flight (in the travel classes stipulated). This is in addition to the Avios points that would ordinarily be applicable to flights on the same route and class. This offer does not include any change to the number of Tier points awarded.