An assistant headteacher has written a scathing open letter of resignation to Education Secretary Nicky Morgan.
Zoe Brown, who writes the Girl on the Piccadilly Line blog, accused the Conservatives of "obliterating" the education system in the six years she has been a teacher.
Ms Brown criticises a string of the government's education policies, including the introduction of more rigorous testing and the government's academisation programme.
She said the only thing "worse than being a teacher in this system is being a child at the mercy of it".
She also tells Mrs Morgan that she has made her job even more unbearable than her predecessor Michael Gove did.
"I was delighted when Gove went. I knew there was every chance he’d be replaced by someone equally awful but I couldn’t imagine things getting worse. I figured the Tories were done playing with education and they’d move on to something else. I was so wrong."
She ends the blog, which is headlined "Sorry Nicky, I'm out", by saying:
Ms Brown's post was subsequently shared multiple times on Twitter.
Earlier this month, the government confirmed a major U-turn in its forced academisation plan, saying not all state schools in England will be forced to become academies.