Hi, I'm Mrs Chivas. I just saw this thread and thought I'd add my tuppence worth.
In the LEA I teach in schools have been told that they are not to grant holiday absence for any pupils. We have to mark it down with a registration code "annual family holiday not agreed". We are then scrutinised on our attendance by the LEA. Where pupils are taken out of school and they have a poor attendance record anyway we have to pass details on to attendance officers who can fine parents. This has been our situation for last academic year and this one to. In the school I work in I know of one parent who was fined - prior to the holiday attendance was below 90% (min acceptable is deemed as 95% by LEA) - they were fined as it was felt they took the mick with the holiday; not a case of can't afford anything else as they owned the holiday home they went and stayed in for a few days before half term, half term and a few days after half term.
In my experience any child who misses a week or more of Y10, 11, 12 or 13 is going to find it harder to get their target grades than a child who is there all the time simply because of the amount of work covered in GCSE and A Level syllabi. I understand that people may miss this time through illness but when kids are taken for holidays they can then have the illness time as well which increases the time in class missed. To be brutally honest the vast majority of pupils who are off, for any reason, simply don't bother to catch-up on any work missed even though it is their responsibility to do so; ergo the more class they miss the more work they miss, the more gaps in their subject knowledge when it comes to revision.
Going in June or July sounds great in theory but in an increasing amount of schools the year changeover occurrs then. For example in a school local to me once Y9 SATS are over the pupils all move up a year and begin the new year's work so in June Y7 will become Y8, Y8 become y9, Y9 start Year 10 and all the GCSE stuff that goes with it. The idea behind this is that there is no wind down and perceived wasted time in lessons so pupils have no excuse for wagging or other crazy follies they like to get up to. It also allows an extra few weeks on GCSE coursework which is always a bonus.
With schools being increasingly target driven I am not surprised that heads are saying no to holiday requests. We have so many targets to achieve from within the school, the LEA and the government that they are very pressured and the more we see kids the more we are likely to hit our targets (attendance is one of them!). I don't believe it is right and some holidays do benefit kids in a way that a week in school would not. However, in my experience, the majority of pupils that do go out of school for holidays spend those holidays on the beach or around the pool, some never leave the hotel complex, which is not going to give them any educational benefits although the "stress" relief for them must be nice!!!