No, you can take actions in this case based on the already carried out inquiry,
Then there is no need for a further inquiry - the one you have already commissioned and has reported is sufficient.
... and the inquiry can take into account the actions taken.
Theoretically at some point in the distant future, but it wouldn't really require a statutory inquiry, merely an impact assessment of the actions taken. But it is ludicrous to set up an inquiry to consider the impact of the action, brought forward in legislation, based on the recommendations of an earlier inquiry until ... err ... those actions had been implemented and had been in place for sufficient time to determine their impact.
Setting up a new statutory inquiry to cover the same ground as a previous statutory inquiry whose actions remained to be implemented would critically undermine the whole inquiry process.