During the 1999 Mori survey the LGO were allowed to edit the list of people that Mori wanted to question. That skewed the results in their favour.
During the more recent BMG qualitative survey the did exactly the same thing again. The following note is in the BMG report.
'Before writing to selected complainants the LGO cross checked the list of contacts highlighting any cases thought to be unsuitable either on the basis of sensitivity or any other significant problems which staff were aware of.'
The results were bad enough but can you imagine how bad they would have been if they hadn't been allowed to doctor the list.