If we don't know when the remit was drawn up then we don't know if the[y] had already examined evidence...looked at the parents and then decided abduction...
I asked about Operation Grange's remit (together with several other questions about Grange) on 12 August 2011, by way of a Freedom of Information Act request. The Metropolitan Police refused the request on various grounds. My application and their response can be seen here:
http://www.mccannfiles.com/id391.html It was on 4 January 2012 that they first published details of their remit, and all of that is detailed on pamalam's site, here:
http://www.gerrymccannsblogs.co.uk/press/57jan12/Metropolitan_04_01_2012.htm That tells us that the remit was decided before 4 January 2012, but not
exactly when. I do recall another Yard statement saying that the remit had been decided 'soon after Operation Grange was set up' and there was a reference elsewhere to a meeting of all the Yard's top officers to discuss this and other matters regarding Grange on a date in June 2011. I can't lay my hands on those references at the minute.
I hope that helps.
ETA - P.S. With reference to my earlier comments that Operation Grange is essentially a political, not a police, operation, I would argue that the Prime Minister of the U.K. had already told Sir Paul Stephenson, the then Head of the Met Police, exactly what the remit of Operation Grange was to be. His spokesman was directly quoted on 12 May 2011 as saying that the purpose of establishing this review was to:
"HELP THE FAMILY" It follows from that that all the Senior Investigation Officer - DCS Hamish Campbell, the bungler of the Jill Dando murder investigation - had to do was to sit down and write out the Prime Minister's order into a form of words.
Which he did