Unfortunately for Jet2 its not as simple as move on, this will probably be subject to an AAIB investigation and report because of the nature of the problem and of course the injury to pax in the evacuation.
Three are three likely sources of smoke 1) from the engine/A/c packs 2) from de icing fluid 3) the galley ovens (grease from the deep fried Mars bars)
In any event both Jet2 & the AAIB will want to get to the bottom of it and that will involve the AAIB trawling through Jet2 maintenance records for this aircraft
Whilst RTO are not uncommon full blow aircraft evacuations on the runway are and i'm struggling to remember the last one by a UK registered airline?