Break the ICE: What happens to traditional cars when EVs rule the road

I am sat in the passenger seat of a Land Rover Defender 90 as it pulls off the roundabout onto central London's Lambeth Bridge. Rather than the gutsy roar you might expect from the engine of this 1980s classic, the manoeuvre is accompanied by the low-key hum of a battery. This is because I'm being driven in a car that's been converted into an electric vehicle (EV) by London Electric Cars (see ‘Converting ICE cars to EV’).