Full scheme details to be announced early next week, but in answer to your question it depends on whether they were Withdean STHs last season. 1901 Club members who were STHs at Withdean will begin with the highest priority, followed by Amex STHs who were STHs at Withdean, then 1901 Club members, then new Amex STHs and so on... with those who travel away regularly getting additional bonus points. Probably best to wait until it's officially announced before deliberating over the ins and outs and coming back with more questions etc.