By way of further hypocrisy, the more parsimonious CPI is used because we are told RPI is no longer recognised. Fine. But how is it that student fees can be pegged to it, and consequently, rise much quicker? The government wants its penny and the bun. It's unacceptable - if we had honesty, parity and fairness we probably wouldn't mind so much, let alone be subjected to, these constant inconsistencies.
http://www.theguardian.com/money/blog/2016/may/28/student-loans-next-mis-selling-scandal