Originally Posted by Dave Noble

Priority boarding is not a benefit of Ruby Status ( see http://www.oneworld.com/ffp/oneworld-benefits )

Travelling on BA, you are entitled to select standard seats up to 7 days in advance of travel for no charge as well as use the business class check in

If you want to take advantage of seat selection, you will need to change the FF number in the booking. Just before you check in, can switch back to the BA number in order to collect points there