Oh, not a good time to be thinking of returning with the glut of teachers and shortage of posts (especially if you're MS5) or above at present. You'll need to be 'top-notch', so well done for thinking about how best to make yourself so. Have you considered some voluntary work to familiarise yourself with current school practice. That was what I did after having my family and just talking with teachers and being in the classroom, started pointing me in the right direction to go with my research. Generally the only thing one has to teach is National Curriculum -the new government has thrown out all the Labour initiatives (though some schools still follow them as there's no replacement as yet). Teachers are supposed to be having more control over the curriculum and many schools are doing 'creative curriculum' under a variety of schemes e. g. International Curriculum, Hamilton Trust among others. Safeguarding is a big issue, but many issues will be much as they were 4 years ago, just do a quick check to see if you're familiar with current issues. Keep reading the TES of course. Best of luck!