Hi, have rented car at E.Mids few times, used National but which ever is the cheapest on a comparision site i'd go for! Def dont take the pre pay fuel tho, they wanted to charge me 70euro for a full tank, no refund, there's a garage at the airport just as you arrive to drop the car back, it cost me 23pounds to refill tank. Just be sure when you leave the airport that you have your directions correct, if you go the wrong way your onto motorway and its miles and miles and miles to get back again...speaking from experience!!