Hi Mike1950
We can not give you any advice as we do not have enough information, we would advise you to see help from your local Welfare Rights Organisation;
advicelocal.uk I will try and explain how GPC works based on current rates.
As a couple your allowance is £306.85 pw, because you both receive a qualifying benefit you get an additional double SDP element worth £152.80pw therefore total amount GPC = £459.65 pw. You then deduct both your state pensions and any other pensions and or income. What ever balance is left over will be your GPC pw.
Remember GPC is paid 4 weekly.
Gary