The graph left comes from page 30 of the FSA's Financial Risk Outlook report, which was published in January 2008 (though it is 70 pages long, it's well worth a read, as it is quite prescient).
For me the most interesting thing has been a collapse in credit card lending since 2005 (mainly due to lenders withdrawing 0% deals). Unsecured lending also drops. If the extreme lending in 2003-2004 was unsustainable, so too is the lack of lending in 2008. By contrast, a return to 2007 lending means a return to very prudent lending indeed, compared to the last fifteen years.