Re: Toyotas - @TRT
It works out about the same for me. I swapped my old Rover metro auto for a Prius when it died. The VED covers 75% of the loan repayments, the fuel cost is the same per mile as the Rover, it drives pretty much the same. The congestion charge discount, I've just lost thanks to bl**dy Boris. It's hardly worth investing the extra cost of the car for just two years. The servicing is more expensive, as it requires pretty specialised tools for many jobs and I used to do the servicing on the Rover myself... but the fact I've not had to dip into my spares and repairs fund yet is good - the Rover was always in need of a new exhaust or a new radiator pipe or whatever.
Anyway, I tried out the key trick, and it clamps my key on READY regardless of whether it's been moving, put in gear or anything.