I really don't get all of this: why is it necessary to pay in advance? I'm sure I'm not unique in knowing exactly what cash I have to hand right now, but no way of knowing how I'll be fixed in five months time.
So, would anyone care to speculate on what would happen if I ignored the end-November deadline, and paid by debit card next January or February? Would this be possible, even? They'd hardly impose penalties for late payment would they, given my next-door neighbour mightn't have paid by DD yet quite legitimately? or would they?