I'd recommend a petrol for 6000 miles a year. A Suzuki Jimny might fit the bill, but it's not the most comfortable road car. I'd probably be looking for something like a Suzuki Grand Vitara, Toyota RAV4 or Honda CR-V - although all will be a bit more expensive to run than a conventional hatchback. You could consider a Honda Jazz which is more versatile and has a slightly higher seating position than a standard hatch.