It is probable that no one has seen your personal information. However, if the member mismatched to your record clicked the 'update your preferences' link, they will have been able to see basic contact information. Those details did not appear in the body of the email and they would have been accessible only to one other member.
Despite lengthy investigation by ourselves and our email service provider, we are unable to confirm which members clicked the 'update your preferences' link.
Therefore, whilst we have identified the member who could have seen your details, we are unable to conclusively say whether they did access them.
Although we believe the possibility of your details having been seen are very low, we felt it appropriate to notify you.