The basis for the assumption that a diesel car is less suitable than a petrol car for mileages under 10,000 per year is that the savings from the better economy of a diesel are insufficient to offset the extra cost of a diesel car compared to petrol and the higher cost of the fuel. The more miles you travel, the greater the benefit of the better fuel consumption.

With a diesel hybrid it depends what you are comparing it with. Hybrids are, generally speaking, more expensive than both petrol and diesel cars, although there are few models where you would have a choice of petrol, diesel and hybrid, and none where you can choose between diesel hybrid and petrol hybrid. The other point to consider is that diesel vehicles of all kinds have a DPF, which requires regular longer journeys to ensure it can regenerate effectively. If your 10,000 miles a year involves many short journeys, a petrol hybrid will likely be a better choice.