The thing with electric, Ken, is simply that you get a lot of car for your money after grants... definitely worth considering given the low value attributed to your current car.
I don't understand why you'd want two systems (as in a hybrid) to give you trouble going forward given that the manufacturer itself has told you the hybrid will cost you more to run than a diesel.
Even the well proven Toyota hybrids aren't as trouble free as we might think. Aside from being relatively needy in terms of routine servicing and the potential for huge battery repair bills there are other bits and pieces that go wrong with them. I've heard of men paying Toyota over €200 for a set of spark plugs, for example.
In fact, the younger not so young lad's hybrid Yaris with under 27,000 miles on the clock has been running with it's Check Engine and Check EV System orange lights on for the past month or so. As he's left it here while on vacation and I just got back from vacation I scanned it yesterday... had two faults... one was airflow to the HV battery (easily cured by hoovering the filter on the fan under the back seat) and the other P314A translates to a fault with the invertor coolant pump and/or it's circuit. That's potentially a more difficult one to remedy as to access even the wiring connector on the pump one has to remove the inverter which requires draining the EV coolant circuit. While I can feel the pump running I'm kinda of the opinion that it ought to replaced regardless of whether it's actually faulty (the fault could be in the wiring or a blockage (however unlikely) in the invertor) because the internet suggests they do give trouble (albeit at much higher mileage) and because if it's not pumping (despite vibrating) I don't think it'd be possible to bleed the circuit after replacing the coolant so there'd be a chance of turning what is currently a working car into a non-working car! He's back Tuesday so I guess I'll see if I can source a pump tomorrow and take it from there. If I can't he can either order a cheap one from Poland or somewhere and leave it on the long finger until he's next in the Republic or get it sorted himself up in the United Kingdom of Great Britain and Northern Ireland.