See my post earlier in the thread. I'm sure it will apply to all customers 
But still a bit naff in mid-contract, why did they not wait until each person came out of contract? ok, people can leave, but not the best way to do business.
Indeed. That's what they have done in the past when they change all their plans, etc (i.e. either stay on out of contract prices or renew contract on a new slightly different plan, which is cheaper), which used to be quite a common occurance before the fixed price plans were introduced.
Those paying for the UK calls boost were already hit by a £2 increase for that in January, and a further £2 increase for broadband in April is unimpressive to say the least.
However, I would recommend customers call 0345 1725157 (free from a TalkTalk line) if their current contract price is not particularly competitive, especially after the price rises. You should get straight through to the loyalty team. There are some great deals still to be had (£20 for Fibre 65 and free UK calls boost, both for 24 months, for example). I normally use live chat to renew my contract, but they were offering pathetic deals (more than my current contract price, after price rises!) this time around. I was surprised to find that I got through to a UK call centre on the above number, and it was a much better experience than all the upselling nonsense I had to endure last time I renewed by phone many years ago.