I assume that Colin Sutton told the truth when he said he was told by a senior officer that those chosen to work on Operation Grange would be told what they could look at and what they could not. The fact that he shared this information means that he believed that the officers of the Metropolitan Police could be given such instructions and would obey them.
I assume Colin Sutton was speaking the truth when he says ~
House-to-house inquiries were haphazard and in some cases did not happen at all
“House-to-house, or in this case apartment-to-apartment, inquiries should have happened straight away. It is a simple case of knocking on doors and asking the occupants if they saw anything.
“If you’re on holiday and see a three-year-old girl wandering outside in her pyjamas, the natural thing is to bring her inside and figure out where she is from.
“For all the police knew, Madeleine could have been inside one of those apartments. But it takes lots of resources to do that. Because it was a holiday complex, it was the equivalent of knocking on as many doors as an entire housing estate in the UK.
“That takes the kind of manpower that would not have been immediately available to the Portuguese police.”
https://www.mirror.co.uk/news/uk-news/6-errors-madeleine-mccann-detectives-10272590For example ~ "For all the police knew, Madeleine could have been inside one of those apartments." ~ did anyone ever find out who left the food to rot in the fridge at apartment 5J where two GNR dog teams showed great interest some days after Madeleine's disappearance, as noted by their handlers?