Nothings been "proved" yet. That's why 23 years later, people still wont accept death certificates.
It was due to the establishment, that it has taken so long. I include the government(s) in that both labour and tory, but it was on thatchers watch, with her home secretary, her police chiefs and to think she didn't know what happened is extremely naive or blind faith.
.
A quote from David Cameron last year, "she had been advised that the South Yorks Police force were very close to deceitful."
Like any Prime Minister, they'll do good and bad during their time in office. I used to think Blair was brilliant till he totally reneged on tuition fees and then joined in the invasion in Iraq.