The LED light at 12 o'clock on the neat gadget on my bicycle handlebars is green and that means I can cycle straight on secure in the knowledge that I'm going in the right direction. I'm free to view London’s sights: the boats on the River Thames to my right with the Houses of Parliament looming ahead.
Now the three lights at two, three and four o'clock blink and I know I must take the next right to stay on my pre-planned route. Arm out. Make the move. No drama. Just simple directions. The geography of the city – its confusion of roads, traffic and signals – is reduced to a simple set of instructions. Connected via Bluetooth to the smartphone in my pocket, the gadget, which is called Blubel, is a clear and intuitive satnav that even doubles as a classic bell.