Hi Car147
By the sounds of it you have received you have received a notification letter from DWP of a benefit increase, they usually come out this time of year, I believe it is about 0.5% which equates to £0.37 a week if you get basic ESA and you are over 25 years of age.
They have not done a paper review of your ESA.
Gary
Nothing on this board constitutes legal advice - always consult a professional about specific problems