As far as I know there have been non ex FR FO's hired in recent times, even if they are in the minority.
Days off are 12/mth variable, but most contract bases seem to get 3x4 or a 3/4& 5, single days off are rare, although LGW was at one time receiving 3 off with an early start/late finish on the working days, but that seems to have been solved.
Travelling to & from home/work is done on a S2 (Duty SBY) ticket which you request via sms/computer. This takes precedence over leisure travel tickets, even if you are the most junior & the "holidaymaker" the most senior. Jump seats are at Capts discretion, I have never been refused, the only problem is the rules in UK airspace should you end up LGW based.