Easyjet do sell package holidays but they do not have the loyalty nor the brand power of TUI and Jet2 Holidays, but they are a good solid flight product.
so,
Easyjet may respond to Jet2's new BOH base with more leisure routes from SOU, but they can only be flown to destinations that will not be limited by SOU's runway performance, which could eliminate the Canaries, Cyprus, Turkey and the Greek Islands.
Ryanair of course do not sell traditional Package Holidays (in the true sense of the word).
That is the difference at BOH.
TUI Holidays and Jet2 Holidays (now the UK's #1 Holiday Operator) at BOH will be competing for the package holiday market (which is strong here in this area).
Folk will not now have to trek to LGW or to BRS.
EXT with TUI is a pretty small base with just one 737, but used to be much busier in the past.