A Foregone Conclusion
Why am I not surprised that a final report will not be released until after the General Election and a new budget has been set?
The details already released and speculated upon indicate that this incident is going to result in a very large compensation bill. There just isn't any money put aside in the budget to pay.
Police forces and most large organisations don't have insurance policies. They deposit a bond with the Royal Courts of Justice (or Scottish equivalent) promising to pay any compensation awarded, because they are underwritten by the government, or have corporate assets to cover any likely sums awarded.
Since the government doesn't have any money apart from income derived from taxation, it is the taxpayer that is going to end up ultimately footing the bill, as always.
Look at it this way, the longer it takes, the more opportunity you have to save for the inevitable tax hikes that are on their way to pay for it all.