Out of curiousity, Ihatespiders, when you say you 'do not tolerate liars in my class - pupils or adults' - what do you mean?
Would you, for example, tell a six, seven or eight year old off for lying/hold them accountable for the lie....even if the parent had told them to lie... (ie require them to defy their parents)? Would you go to the office and demand that the 'sickness' code was turned into an unauthorised absence? Would you do this if, for example, your head refused to authorise absence for a wedding/a one off trip that even last year would have been authorised, but is no longer under the new, stricter, regime? Would you do this even if the child/you suffered no ill effects from the absence?
I hate this system as I feel it encourages people to lie: sixty quid is a lot of money in a system that does not have much flexibility (and in an area like my own where a very large percentage of children come from very low-income families).
(fwiw - i do not lie re absences, and have not asked my own child to lie, but then my child has always had a sympathetic head and an LEA that only fines after a sustained period of absence).