The Information Commissioner has responsibility for data protection matters.

Incorrect reporting to credit reference agencies is a data protection issue so the Information Commissioner's Office is a good contact point.

This is a pretty complex issue however - I'm not sure whether they'll see it as being a case where you can be provided with a black and white answer. No harm in trying though.

Just a wee update. Called the ICO and they say that the credit file has to be shown to be factually correct. So as long as the shortfall from the vol repo is shown as being satisifed once the trust deed is discharged then it will still show on the file for 6yrs until after the date of the event. So the vol repo happened 3yrs ago and will stay on for a further 3yrs before dropping off his file but the debt will show as being satisfied. That makes sense to me I guess. I don't think it would affect his chances of obtaining a mortgage any more than it already would do anyway as you say TD Assistant most lenders would ask if you had ever had a vol repo before anyway so whether it actually shows on the file or not is irrelevant in some ways as he would need to say yes and tell them when anyway.