Like you Oldtimer, now I am retired I run a strict budget control system. O.K., I would like more coming in (wouldn't we all), but I run two spreadsheets on my PC, the first is an annual approximation of all income and expenditure, itemised by month. The second is a prediction 2 months ahead of the bank account status. this enables me to plan ahead our limited income to ensure that money is there for the things that we want. We do use credit cards as this enables me to defray and expense and ensure that enough is in the account for when the bill arrives. They are paid off by Direct Debit every month as is every other regular bill we have. I applaud your 'rules', those we apply are very similar, so at present we even manage to save a little each month.
M.