Chowder
Suspect Jet 2 make most of their money on the 757 in the Summer so aircraft sitting around in winter is the norm, perhaps more so for Jet 2 than others like MON/BY/TC etc. Apart from Canaries i guess the 737's do the majority of the work.
Lovely
If Jet 2 gets 767 they will use them for anything and everything. I could see them picking up flights for some of the tour ops to Orlando etc easily. They will also ACMI them as the 767 is a ideal fit for a wide body sub charter. In the Winter i guess the Haj may come into play. I don't see them being used on scheduled services unless they DRY/WET lease them out - always a nice earner
Of course it's likely that if they do get 767's they won't be brand spanking new, 767 hull rates are still fairly high i'm told.
Good luck to them is all i can say, any airline expanding is good news