Thanks for the welcome, everyone!
I should qualify why my mileage is so low - I don't use the car for work, only for shopping trips, visiting relations and the like, but still want a good reliable runabout, which the Jazz does perfectly. I'm definitely going to take it on a few more drives just for the hell of it - I gather a longer run on suitable A roads is pretty good for them.
I've been a passenger in bigger cars, and not one utilises space as good as the Jazz does. In fact, I've found it pretty hard to squeeze in and out of these larger cars, a problem that neither myself or passengers have where the Jazz is concerned.
I agree on people's misguided ideas about so-called "British" cars too. I've never yet bought a product solely on it being British - my only questions are "does this product do exactly what I want?" and "will this product be reliable?" As culzean points out, the Japanese have been more loyal to the UK than most, a point seemingly lost on Joe Public.