Ofcom won't protect you, all they're looking at is to see the rules are followed, but the problem is the rules themselves.
Whether it applies to you I can't say - there will be a cut off date where contracts after that date are deemed to have had this year's price rise included, but as always VM are as clear as mud on such matters and I've not seen any reference to the date (or dates, they won't make it simple). If you've had a price rise notification then you should be in line for your inflation busting price increase.