Collusion
These in contract price rises will be the next big public scandal.
I don't know whether there has been some post-Brexit change to competition law that means telcos can get away with this, or whether the regulator simply sees its role as one of protecting corporate profits more than consumer interests.
In either case, the overall effect over time is to circumvent competition in an organised way.
It used to be that you could normally get a good deal at contract renewal time. Either a competitor would offer something more attractive in return for the hassle of moving to them, or your existing ISP would keep your existing price or reduce it in return for locking you in so they didn't lose you for a further 12-24 months, maybe with a new router to sweeten the deal.
Now, customers no longer need to be fought for because collective action by ISPs over a couple of contract cycles has successfully raised the overall floor price in the industry by a very significant amount.
You won't be able to shave the manifestly excessive 14% in contract rise back off again at renewal time because all the prices have gone up by that much. And the value the contract lock in now has is purely to the provider in establishing the legal basis for that to continue. The consumer has no choice. You might get a few months discounted from a competitor, but they preserve the overall higher-and-rising price floor in the industry by jumping to the "normal" price after that, as well as adding a further inflation-busting increase the following year.
Sure, this makes it more difficult to calculate the true cost of the contacted service, but that isn't the main effect.
Ofcom focusing on making the price more transparent is a meaningless distraction from a consumer perspective because a subverted market means there is no meaningful price competition keeping a cap on costs.
A price which is higher than it would otherwise be in a fair market is still a high price. Being clearer about its true level doesn't help you avoid it.
The scandal is the collective action and abuse of power by commercial interests working in concert to distort the market over time, with the connivance of the regulator.
Inflation is different for different products and industries. Technology prices, historically, do not rise with the Consumer Prices Index. An index is an average. If you impose a particular level of inflation on a market then by definition you distort it.
There is no justification for a CPI + x% formula, nor for price rises within a fixed contract. Those are unfair terms.
How is it different from continuously doubling leasehold ground rents? In principle, it isn't.