I really appreciate your input so much. Thank you

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Ok. So I have no assets, no vehicle to run. Should be straightforward!!!
I am trying to find total expenditures allowed for 1 adult and 3 children but cannot find figures anywhere. Is this information only available to selected people?
Going by what I can put on my form (so much that I pay for is not allowed. i.e. judo, swimming, birthdays, Christmas, pocket money. All for the children of course).
I also have 2 cats to budget for.
I myself never go out socially, nor do I drink or smoke. The budget that I can do on what is allowed, (electric, gas etc)is looking like I have surplus money of around £150. I know I don't, but nothing is adding up.
Can you give any advice as to what I can put down and how much for 4 people.
I know what I cannot budget for.
Also I have been told that I cannot have anything for emergencies. So what happens if my washing machine or fridge breaks down?
Will the fact that I am on benefits discount me from an IPA regardless of how much excess I have?
Thank you once again for your help.