Like all the G&T suggestions - just bought a bargain 1 litre Bombay from Tesco, need to try some of the new tonics and fruit additions clearly 
On Gap Years, planned or otherwise, my DS2 took an unplanned Gap Year, and it was the best thing for him. He had fractured his right thumb first term of A2s, for him the worst of it being he was unable to play rugby, but of course he couldn't write either - three essay subjects so that was tough! He finally got to play rugby after 5 months (and for Wasps U19s), but he had a long way to go on his fitness. He missed his A* that was needed for English at Bristol - and they wouldn't consider him even though he had a Distinction in his PreU History (plus AA at A2 and AA at AS). he rethought his plans and decided to change course to Politics and Philosophy. During his gap year he was able to have driving lessons (again fracture put stop to that), look at a couple of other universities for Politicis and Philosophy, including Durham that he eventually chose and loves; he got some bar work and played rugby for very high level non professional club, including a trip to Jersey and winning two awards at the end of Season. His confidence grew and best of all I got to spend time with him. Without the pressure of sixth form, essay writing and revision he was so much nicer to be around!. I think we got closer, his sense of humour returned and he helped with shopping and cooking! The only downside was how much I missed him we he went off to Durham early for pre season rugby training
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The pressure of sixth form is exhausting, so whether it is a case of making the most of the summer months or taking the whole year, a break, a change of scene, sport - whatever helps relieve the stress is vital.
Off to work soon, working with a lovely girl in a local sixth form, she going through similar trials for Art, one early rejection, an interview yesterday, sending electronic portfolios etc. One offer so far, one not even acknowledged her application!. She needs A in Art and As or Bs in English Lit and Psychology! She is managing to smile still, well at work anyway!