Returning to the OP - I increasingly feel it'd have been a triumph for British Justice if the case had never got to court. As others have pointed out, no ceiling was ever set on how much the Grim sisters could spend on the credit cards. Neither the accountant, or those who paid off the credit cards raised it as an issue till it had been going on so long, as to seem an accepted part of life in the household.
What a I do find increasingly distasteful is the way the Saatchi continues to drip feed allegations about Nigella to the media. He seems to forget, he accepted a caution for assaulting her, in a public place. By continuing his verbal assaults, in the public media, he only confirms he is a nasty bully, who will lie, or change his story to suit himself.