We now know that many in the UK were fully aware of the Jersey abuse.
The educational institutions were aware, the police, the Dukes (Chancellors of Cambridge and Surrey), Whitehall, etc. The reason behind the belated response had to do with the fact that the abuses were being carried out by elites.
The controls over institutions were, and still are, top down. With some spivs inside functioning as informants and enforcers of discipline.
There have been, recently, further indications that the UK politicians were either nonfeasant or malfeasant. The recent scandals reveal that British politics is in bad shape. The trust in politicians is at an all time low, for good reasons.