In case the OP still has a hankering to teach in the UK, this from the BBC
Many teachers 'stressed in class'
Half of teachers in England have considered quitting the profession because of stress, a survey suggests.
Two thirds of the 823 teachers polled felt stressed by teaching, half of them during lessons - the biggest cause being disrespectful pupils.
One in 10 told the researchers for Teachers' TV they worked longer hours than EU rules permit - and 60% blamed the amount of paperwork required.
http://news.bbc.co.uk/1/hi/education/6369867.stm