hi landlady!
at EF LHR there are some crew who work on a 6 on 3 off contract,anyone else can bid for whatever days off they want,i tend to work mon-fri with weekends off and every other week i have sat,sun,mon off,we get 10 days off a month(9 in feb)but with availabledays you are sometimes NON-OP so get extra days off,hope this helps!