The guilty ones are trying to divert the tide of blame towards officials at the Fees Office. "I acted within the rules" is no longer acceptable as an excuse. The public won't buy it. But they are still whining on about having agreed their misdemeanours with the Fees Office.
I wonder. The officials they discuss these things with are relatively low-ranking civil servants. The one thing you can say with certainty is that MPs are expert in arguing. They have all spent years, decades even, getting their point of view across. They have fought in debating societies, smoke-filled rooms, on doorsteps and many, as lawyers, in the courts. It seems to me a rather unequal battle pitting these professional arguers against expenses clerks. To then blame the clerks for losing aforesaid argument really is low.
Let us hope their tide-turning is as effective as one King Canute's.