Tens of thousands of teachers march in London as half a million workers go on strike in Britain, calling for higher wages in the largest such walkout in over a decade, closing schools and severely disrupting transport. "We love our students, and we want to empower and better the next generation. But... we're way past our limit as teachers in terms of putting up with the conditions that we're working in," says history teacher Stephanie Lewin. IMAGES AND SOUNDBITES