27th April, 2013, Clink Street, London
An except from a text message I just sent my fellow watchmaker Simon Michlmayr:
"Dear Simon - Forgive the intrusion at the weekend, but I have no-one else to share this with. In my lab in London there is an LED on a circuit board flashing at one pulse per second. With an accuracy of 50 parts per million million (5e-11). The atomic clock has started ticking. RH"