The first part seems somewhat reasonable - though I would point out that the "lack of support from the top" goes much higher than Hayman. After all, by this point in time it seems there had been at least one select committee investigation and report into this, as well as Operations Motorman and Reproof, and the Government themselves (as we now find out) were well aware of what was going on to the extent of being repeat victims of it themselves(but were utterly (in public at least) unconcerned about it). In short, noone at the top of Government did anything, so its a bit rich to pin this on Hayman.
As for "appropriate department of the Met" - there probably wasnt one then, just as there isnt one now. They would have had to set up a team to look at this (as they have done now) and basically steal officers, police staff and office space from other departments and squads, all of whom would have their own thing to focus on and their own management teams complaining about it.
