At the bottom of the list you'll mostly be touring. Most people have a family and prefer to return home at the end of the day, so all high credit day trips are senior trips. A junior pilot will mostly be doing 3, 4 or 5 day early tours over the weekends. The junior lifestyle isn't that great and seniority for a command on the Airbus at LHR has dropped to 8 years this year, the lowest it's been for a very long time!