In simple terms when it decreases to below zero, which is expected in 2024 and last for approximately 2 years then settle at 2% thereafter.
https://obr.uk/forecasts-in-depth/th...inflation/#CPI
If you want more information search for the office of budget responsibility, Economic and fiscal outlook from Nov 2022 paragraph 14, chart 14.
This area of the report shows how the UK economy will fall from 10% CPI to a long term 2% rate which is continuously discussed in any BOE statement. Everything at the moment is a blip. The only thing not expected to fall to low levels is interest rates which is expected to settle at 3%.