The car parking arrangements changed in March 06. You now only get one parking pass. If you choose LHR, you can no longer park at LGW. You need to catch the bus which runs around every hour to hour and a half. Add to that you need to leave extra time in case you hit traffic and miss the bus, it adds a lot to the day. In reverse, you often land and just miss the bus back, so you have to sit around for an hour and wait for the next. It's a major pain and does not count towards hours and fatigue.
Not sure how legal that is. If Virgin won't provide a pass for the correct airport, then you'd think they'd have to allow the extra travel time you are expected to do.
As for weekends, you get one off a month, but this can be Fri-Sat, Sat-Sun or Sun-Mon. Crew who have been there a year can bid for one trip a month, or one time off a month. Many tend to bid for a four day trip on a Monday, which means they get two Sat-Sun off a month.