Thanks for the responses, everyone!
I'm coming from the US where teachers are miserable due to constant paperwork, standardized testing, out of touch administration, etc; so it sounds like teacher morale may be about the same in both places.
As far as UK curriculum and standards, where should I look? The US doesn't do any sort of standardized testing for music so if there are expectations along these lines, I'd like to know before I start.
Teaching in a secondary school (middle and high school in the US) you teach GCSE and A Levels, generally. GCSEs are a standardised test/ qualification - check the AQA, OCR or Edexcel websites for specifications for the exams.
A Levels are for students 17-18 yo and follow on from GCSEs. The specifications are probably on the same websites.
I'm a teacher (physics). The only way a Music teacher will get a job from abroad is if you already have the right to work in the UK.
To get a flavour for morale, check out tes.co.uk
Oh and because pay
is performance related (to said GCSE and A Level results) you will never get a raise. So expect pay to max out somewhere around £25k. Cost of living in the UK is significantly higher than in many parts of the US, except perhaps New York, SF, etc...