Have had a look around Tracy and the only one I can find is J2HSPF50 it's from Jet2's website but appears only to be for single parent families:-

http://www.jet2.com/News/Families_First_for_Jet2holidays/

jet 2 very rarely have any promotional codes or money off codes- on rare occasions they offer a £50 -off code- which is always advertised on their website (Ie £50 off a holiday in oct/nov) - my findings//opinion- is the holiday has already risen by £50 compared to the weeks prior to this.

belly