Indeed, the relative importance of that and the AM/GM change ("formula effects") can be seen in this document from the UK Office of National Statistics https:/

Indeed, the relative importance of that and the AM/GM change ("formula effects") can be seen in this document from the UK Office of National Statistics https://web.archive.org/web/20101214034940/http://www.statistics.gov.uk/downloads/theme_economy/cpi-rpi-information-note.pdf https://web.archive.org/web/20101214034940/http://www.statis...