I have booked 33 tickets to Edinburgh and back. When doing so you can 'reserve' seats so that you are the only person allowed to sit there. I reserved all possible. This was 32 seats for the outward journey, 23 for the inward journey. If you don't reserve a seat, you will still get a seat, but it may be next to some stinky member of the public.
Please fill out the form and wait for confirmation that the seats are still available from me directly before sending money