Reminder: Until the 30th of June, book and fly British Airways across Europe to earn up to 16000 bonus avios.
With 2 return flights you will earn 4000 bonus avios.
With 4 or more return flights you will earn 16000 additional avios.
Don't forget to register here before you book your flights.
This deal is especially good when you are combining it with a tier points run, for example using the LUX – LHR fare, or if you have to travel BA anyway until the end of June.