In that regard, Mervyn King describes inflation targeting as a coping strategy, ﻿[11] coping with the inability of other monetary policy frameworks to deliver the required outcomes. Central banks in many cases didn't have a lot of public credibility in terms of macroeconomic policymaking.
In the Bank of England's case, it wasn't the monetary policy decision-maker, so the institution itself didn't have any track record of monetary policymaking. So in the UK, as in NZ, Canada and Australia, there was a need to build that track record. A track record requires a track. Inflation targeting provided that track.