It can be done. I have two sets of redemption bookings for 3 pax in the school holidays later this year. EDI/LHR/DXB at Easter and EDI/LHR/SFO/LAX/LHR/EDI in the summer, 3 sectors in F and one in CW. These are admitadley in the Scottish school holidays and were booked approx 6 and 9 months in advance.