Want to turn your bicycle into an e-bike? Here’s just the gizmo

With Swytch, you can clamp a wheel, battery and sensor to any model and enjoy a power-assisted ride

I've been something of a sceptic about technological bike gizmos over the years, add-ons that too often seem to represent a solution in search of a problem, an attempt to reinvent something - the bicycle - that was not far short of perfect anyway.

I'm no luddite. New developments make cycling even more enjoyable and useful, not least near-puncture proof tyres and tiny, retina-searing lights. Plus, of course, there's the amazing world of electric-assist bikes, or e-bikes.