Last year I earned a total of 400k Avios, with 64% (250k) coming from credit cards. These are the cards I use...
Last year I earned a total of 391,496 Avios, with 64% (250,931) coming from credit cards, either from sign-on bonuses, spend, promotions or referral bonuses.
There are three key credit cards I rotate through to earn these Avios, being:
British Airways American Express Premium Plus card (BA Black card);
American Express Gold Preferred Rewards card (AMEX Gold card); and
Starwood Preferred Guest American Express card (Starwood card).
Please note that I am not recommending any of these cards - merely setting out the facts regarding how I have used them to earn Avios. I pay off all credit cards in full each month otherwise the interest costs would outweigh any benefits I receive.
If you are intending to get any of these cards, make sure you have set up a BA Executive Club Card account (the place where your Avios accumulate) - https://www.britishairways.com/en-gb/executive-club - It takes 5 minutes, max, and its free. If you have a better half, get them to open an account too. You can then combine your accounts to create a family account, which essentially allows you to pool your airmiles.
Note down your Executive club number and provide it whenever you sign up for a credit card so that your credit cards and BA Executive Club accounts are linked.
The order to get these three cards depends on your start position. If you already have a healthy stash of Avios (c.150,000+) then the best card to start with is the BA Black card, as you can earn a companion voucher which essentially doubles the value of your Avios. If you don’t have a good stash then a companion voucher is worthless so it is better to start with the AMEX Gold card and then the Starwood card.
For £12,000 of spend a year you can net 168,000 Avios which will get you a business class return flight to most places in the world (possibly two return flights to somewhere like NY).
For £25,000 of spend a year you can net 253,500 Avios plus a companion voucher which will get you anywhere you want to go, plus some.
Check out the rest of the uktravelhacking.weebly.com site to find out what to do with each card.