I know that this time last year Jet2 weren't interested in doing baggage, which struck me as odd considering they were about to start self-handling.
However, things have changed, e.g one or two new faces in the Jet2 management/director scene and a change of airport ownership so there could be a change of attitude. To me it would seem logical as Jet2 practically monopolise Hall B in any case.
At one time I gathered Menzies might be interested in doing baggage though not necessarily for Jet2.