Interest payments relative to household income have declined, and are much lower than a decade ago. The answer is all of them. Almost every day the postman delivers evidence of new entry into the credit card issuing market, or so my credit-worthy friends tell me. More flexible mortgage products are becoming available. And from time to time we have so-called mortgage 'wars'.
Some borrowers pay a great deal more.
And in any case it would be foolish to suppose that a market that has become more competitive has necessarily become very competitive. For example, lots of entry can point to fat margins as well as thin. The rapid expansion of credit that has been witnessed in recent years is bad news from the perspective of the Polonius school of finance in Hamlet - 'Neither a borrower nor a lender be'. It is certainly something for central bankers, banking supervisors, and indeed lenders of all kinds to watch, perhaps even hawkishly. But as far as I am concerned, the aggregate picture has much good in it.