Massive thread drift but TUI and particularly Jet2 have little to fear from Easyjet or God forbid, Ryanair, entering into the package holiday market.
It's called customer service. The latter two dont have any. They are fine to get a cheap return ticket to a city of your choice but no way would any sane individual trust their yearly family holiday to be run be either of them. For sure they will be cheap, but you will get what you pay for.