It added that, following professional advice, the family would be makingnocomment on the police investigation or on any aspect of Mrs Mills-Westley's death.
Former Conservative leader Michael Howard, who has been reported to be furious at Mr Willetts over his speech, has said he is makingnocomment on the row.
"This was always the starting point in relation to the issue of sanction for the proposed international round, and as such we will be makingnocomment until after that time, " the spokesman added.