You need to think beyond Wimbledon
The electric version of the diesel tractor I bought (identical spec. other than the fuel type) was three times the price, which I couldn't have afforded even if it made long term financial sense (which it didn't). I keep fuel for it at home because the nearest forecourt is a 12 mile round trip and it does 10 mph flat out
Actually as an 'agricultural machine' (tax class) it's restricted to a maximum distance of 1.5 km on road anyway.
I also keep petrol for my old ride-on mower, which I paid £700 for 2 years ago. The only electric equivalent I know of (in terms of cutting width) is £7,300 new (too recent to be readily available second hand).