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Over the lifespan of a second-hand Picasso, the only thing you've really got to worry about is road tax and fuel duty. There's a possibility that tax hikes could be used to push diesel drivers towards petrol cars. It's unlikely to be totally punitive, but you might find that your cost of ownership goes up, with a commensurate increase in depreciation. I certainly wouldn't buy a brand new diesel, but a five-year-old one would probably be a reasonably sensible purchase.
Zero-emissions zones will make plug-in hybrids a much more attractive option. Dozens of European cities plan on either banning internal combustion completely in the city centre, or introducing a punitive congestion charge. Manufacturers are planning for this with a selective hybrid system, allowing drivers to enter and leave the ZEZ in pure electric mode. Once you've fitted the essential gubbins of a hybrid system, it isn't that much more expensive to add a charging socket and bump the range up to 30 or 40 miles. That kind of range will allow a majority of drivers to make the majority of their journeys on electric power alone.