2 part post:
I don't know the size of your family, which obviously affects some of the items. Comments are:
1. Is this the total income, including any benefits? Does your mother pay you any rent, or have you included her income (I assume she has a pension or else claims Pension Credit) in the total? It would be normal for you to receive some rent (or at least a contribution to costs such as heating lighting & council tax), & then for your mother to be regarded as a separate household with her expenditure excluded from your figures. On the other hand, if in practice you live together with her as part of the family and therefore include all her expenditure with yours, you should also be including her income.
2. You seem to have omitted any expenditure for gas, electricity, water, travel (car or public transport), health (prescriptions, opticians, dentists etc.), toiletries & cleaning materials, and clothes.
3. The food figure seems quite a bit too high unless the family is very large or there are special expensive dietary needs.
4. Is the �100 for mortgage arrears as a result of a Court order or is it a voluntary arrangement with the lender? If the latter, it might get queried unless you can show the lender would otherwise go for repossession.
5. Phone looks very low, especially as you also presumably have broadband.