Hatton Garden is the jewelery centre of London famous apparently for diamonds. Now you know where to go to buy the ring. You can also go there if you want to buy a clock that doesnt go tick-tick-tick and ruin your sleep. Head to the Grayson clocks] showroom and get a clock with a sweeping second hand. Because of high-frequency quartz crystal (about 120hz), the second hand is pushed smoothly without making the dreaded tick-tick noise.