They rather bafflingly call it £X .00 for so many months, but, unless you have the Fixed Price Plus (more expensive than the normal discounted price) your tariff is subject to the April CPI+ 3.7% increase (read the Ts&Cs, linked at the foot of the page, @Paulyboy1).
Another thing that can cause a change is if a discounted boost price expires or the boost price increases. That's not part of the core contract, as a boost can be removed any time after a month.
Gliwmaeden2, a fellow customer.
From the 29th of March our TalkTalk Community will move to peer-to-peer support and the TalkTalk team will no longer be here to support with queries. Don’t worry we still have plenty of ways to reach out if you need to speak to TalkTalk directly. For more details check out the link in the post at the top of any forum message board.
