At present only large companies who can write-off car expanses are using hybrid luxury cars to advertise themselves as environmentally friendly wealthy companies.

What we want is a small smart light weigh car with under 1000cc engine that can do 200 miles on open road and then switch to a small low power battery/motor that can do just around 10 miles inside the city boundaries. 

NOTE.  One standard 12 volt lead/acid battery 100 amp-hour contains 1kWhr of energy.  Small petrol engine is typically 35kW; so 3 batteries will give 3 kWhr which is just sufficient.  Or is it???