See http://www.sky.com/shop/terms-conditions/talk/code-of-practice/tariff-guide/

Amongst other things 0845 calls are increased to 6.63 a minute from 6.13

The connection fee for non-inclusive calls will increase from 12.5p to 13.1p

Sky point out that if your a Sky Talk Unlimited customer and you are not happy with the changes , you may cancel Sky Talk without charge.