So 3 more 757s - all ex China Southern machines, currently out of use (cn 24014/5/6) plus 2 additional RB211 engines. So 9 757s for S07.
Now, thus far, next year's Jet2 programme needs
LBA - 3 757s
MAN - 2 757s
BFS - 1 757
NCL - 1 757
So that's 7, thus 2 frames are spare at this stage.
Answers on a postcard!