In the summer in LTN you'll hardly ever be in LTN, usually be in BHX or EDI if that is a base for s05. Winters you get availables and standbys as well as flying duties. Availables mean calling a phone line the day before, or being phoned on your day off (so don't answer the phone).
Rosters rarely resemble what you will actually do. You will always more or less get 2 days off in a row, but getting a whole weekend off is a rare thing, trust me.
You are joining a VERY unhappy workforce, bear that in mind!!!
Great colleagues you will find, but there are better jobs out there.
EGGW.