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.
I will stop there and hand the floor to our guest. Dear Madis, over to you  2/2  BIS - Central bankers' speeches