Brexit clock is not counting down yet

After a turbulent three weeks, a new PM is in charge. She is going to make Brexit work, she tells us, but Brexit hasn’t actually started.
The EU is legally unable to act on the referendum outcome, at least officially. Even though the currency and stock markets have been in turmoil since the referendum vote, nothing “Brexity” can happen in Brussels until the [resident of the European Council, Donald Tusk, receives a properly accredited letter from the British prime minister notifying him of Britain’s intention to leave the EU.