Oh that was you!
God I remember that, shite thing to happen. good grief.
Look don't worry about the letter. I seriously doubt anything will come of it and even if it did it only takes a moments chat to realise that you are not slacking in trying to educate your child which is all any would care about anyway.
An as I say, he isn't five yet so doesn't even need to be at school (legally).
You did what was necessary and right. don't worry.
Dunno why holiday wasn't authorised. Can only guess it was a general policy of two weeks holiday authorisation and no more. clearly no taken into account your individual circumstances. But hey, don't be too harsh on school it is easy for individual reasons to get misplaced. Terms over now anyway. start afresh in new term. no biggy?