Jet2 have got spare aircraft sorted perfectly! The spare 757 today will operate the LBA-HER which should have gone on the back of the PMI. It's far easier to delay a PMI than a HER, and coach over to MAN where there is a spare 757 this afternoon as crew issues do not come into play as much for a shorter PMI. I don't know what airline you work for JSCL, but in every other airline I know, loosing an aircraft in the first week of september, (probably the biggest repatriation weeks of kids back to school all year) IS going to cause a major knock on issue.
I saw the gash in G-LSAE this morning, I'm sure OCS - One Crap Solution, won't be hanging around Leeds for long now as that is one expensive repair.