Jet2 - 320, 7 on 2 off certainly isn't the norm. In fact I've never worked 7 on ever.
It also does not mean that you will only get 3 days off after 7 on either, in fact my roster currently goes 4 on, 3 off, 2 on, 2 off, 2 on, 3 off.
Budar, lates to earlies or vice versa sounds awfully fatiguing to me. ASR and don't accept which is easy as those kind of changes cannot happen on the day. However, if, like Gorter, you don't have the spine to stand up then suggest you become a stay at home hubby.