I think as someone already pointed out - the letter was just a standard letter that is sent to everyone.
However I do think that parents shouldn't really take their kids out of school during term time. for holidays.
All parents are in similar situations - can you imagine if all parents just decided randomly to take their kids out of school for holidays or because they felt like it for a few days etc. (this is not directly aimed at anyone on this thread - just my thoughts)
How would the school manage - so they have these rules in place to avoid these situations - to standardize , this way they can level the playing field in terms of education.
They then blanket apply the rules to all to avoid having to constantly sit there managing attendance - teachers have a hard enough job as it is without having to have the additional burden of paperwork / admin for holidays.
I can understand that during the last 2 weeks the kids may not do much at school in terms of learning - but should parents be the judge of that or should that decision be left to the teachers who are considered the experts.
What if a parents decides that during February they need a break and that the English and maths lessons aren't important enough to warrant keeping the kids in school - where does it then stop - a crude example but hopefully you get my meaning.
Rules are in place for a reason - why do people feel its OK to break the rules and that their reason justifies it.
Its the same for all rules really - if they get broken then people need to accept the consequences if they are punished.
Why do people assume that they will be given the time off and then when its rejected get annoyed.
Why bother asking for permission if they have no intention of honouring the decision just beacuse its not the decison they wanted ?
Having said that I do sympathize with the OP - I've been in that situation before, I did deal with it differently though as I took my son without my wife , not ideal but it was either that or nobody went.
I've also been in the situation where I've had to pay far more for a holiday during school holidays (and still am) - it sucks but its the same for all parents really and goes with the territory of having children.
Its a shame the govt or regulator/body don't don't do something about the price hiking antics of holiday companies during school holidays - its effectively holding people to ransom - but thats capitalism for you I guess.
Sorry if its a little off topic

Just to reiterate this is not aimed at the op or anyone in particular - just my thoughts