http://media.ofcom.org.uk/2013/01/03/ofcom-sets-out-proposals-to-tackle-mid-contract-price-rises/
dont hold your breath though,Ofcom still havent stopped the "unlimited broadband usage" scam
Too late for you, but Ofcom are currently looking into these contracts whereby prices go up mid-term with the view that people must be given the choice to cancel and go somewhere else l if they wish.
The isps will get around this by raising initial contract prices, they have their secret unspoken of cartel, so theyll all do it, like the power companies they will not lose out one way or another
dont hold your breath though,Ofcom still havent stopped the "unlimited scam"