From the Guardian:
As it stands, the new government's much-trumpeted new fiscal watchdog has no permanent home, staff or clear lines of accountability. Now it has lost its chief. It is now a figleaf for Mr Osborne's plans to slash spending. The chancellor would be wise to rethink his new institution, and give it some real resources and a better mandate. Far better would be an Office for Economic Responsibility charged with protecting growth as well as the public finances. It should be accountable to parliament, and answer queries from select committees. A head that hung around for a bit would be an idea, too.
I’d agree with all of that.