I think Ryland's suggestion will probably work best for you. It does eliminate the ability to run on electric only in stop and go heavy traffic, but, it is far simpler, mechanically speaking.
I think a fairly high voltage motor/generator/starter mounted where the alternator currently lives could work. Being an electronics type, you should be able to come up with some sort of engine stop/start system which would maximize city mileage.
You should also be able to regulate whatever voltage you use down to 12 vdc to handle the rest of the car's needs.
Good luck with it, Chris. Show us that an englishman can actually make a functional auto electric system (insert obligatory Lucas joke here).
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