Virgin informed me that my bill would be increasing by £4 a month. I phoned them up and told them I'm not paying it. Big sigh from call handler, 'Fine, we'll give you a £4 a month discount for 6 months'.
Just received the confirmation email - I'll be paying £4 a month less than what I'm paying now for 6 months, then it will increase by £4.
Phone call lasted all of 2 minutes. If you've had your notice of price increase, give them a call.