Hi Vallumlj,
The service schedule in the manual states that if you do less than 6,000 miles a year, the oil and oil filter should (or must) be changed every 12 months. I cannot remember the specific wording but your car would defo fall under the category.
My personal opinion is that it is a good idea to service your car annually, especially when you are doing such low mileage.
However I would ring your dealer and tell them to give you a proper price for an oil/filter change
. The consumables themselves are about £40 and labour even at a main dealer can't reasonably be more than £70 for an oil and filter change. So that's £110. You see where I am going here!
The other option is to use genuine Fiat parts and go to a good VAT registered independent garage. A perfectly good option.
However, as your car is still in warranty then IMO it is better to keep it within the dealer network for the first couple years in case you need to make a claim. Loyalty shmoyalty and all that