Just saw a woman at M&S Simply Food check-out, pay £1000 cash onto her Credit Card. 50ish year old smart looking Indian lady. Cash is king. 
Discussion
How does this work...
She has a credit card with maybe 2k spent on it. She then goes to the check out and deposits 1k onto her credit card in cash to reduce the balance?
I reckon she runs a cash generating retail business, maybe an Indian restaurant, and pays the maximum cash she can each month off her personal CC.