To clear up the debate on number of points from Tesco.

With a basic Clubcard you get 1.6 BA Miles per £ spent.

With a premium Clubcard that doubles to 3.2 BA Miles per £.

If you pay with a Premium Plus BA Amex that is a further 1.5 miles per pound.

Total = 4.7 BA Miles per £ spent (of course not including any bonus points).