Daollo Airlines have never operated their own metal on that run.
Jet2 are doing it till about Feb/March im lead to believe, Daollo have previously used Airtours/MyTravel with their 757 and 767 from LGW, as well as other carriers, before Jet2 it was Air Slovakia who pulled out at quite short notice. However jet2 are having a few problems getting the cabin crew do to the flights.