The best plan is; no plan at all. I'll see how it goes, my budget, spendings, if the car passes mot straight away? any nasty, unexpected and unforeseen financial surprises?
There are lots of factors beyond my control which may affect the spending and budget so if these are very small and minimal, the 'no more shaving stuff buying' promise is forgotton and the amount of razors, brushes, soaps etc.. increases