These terms that basically allow the mobile companies to increase their prices in-contract in line with inflation are absolutely horrendous and should be challenged in the courts.
Moreover, doesn't EE see that this is an appalling way to treat customers? If a customer has X phone on X tariff over X months, there's just no way the network should turn around a few months later and change the terms of the agreement. I have no sympathy. Any increases shouldn't take effect until the end of the contract.