Spotted this on the 'Offers' section of American Express.
"Get 2 additional Avios up to a maximum of 4000 additional Avios for every £1 spent anywhere until 15 June 2021. Offer only available to the first 80,000 Cardmembers who save the offer to their Card. Terms and payment restrictions apply."Assume you need either of the BA/Amex Avios cards to see this offer.
Full offer terms: