I really don't a few things about where we stand now.
Firstly, the decision to impose zero flow rates was not NATS' alone. It'd be foolish to use the ANSP as a scapegoat.
Secondly, the ash situation is no better in many ways than it was last Friday, yet now the Government, facing an election and some pretty strong pressure from BA et al, decide it's fine to fly now, but not then.
Not rocket science really.