Qatar Airways is now using avios as points currency, if you join Qatar Airways Privilege Club by 31 March 2022, using the promo code FLYQR3, you will get 2,500 bonus avios instantly, for free, which can be transferred to British Airways.
When you create an account, you will be asked to link your British Airways account.
Those avios can be converted 1:1 to British Airways via the “Combine Avios” function.
If you have a household account, you can repeat this process for each member ;).
Link to the Promotion