Not my experience Bob (if there is difference between UK vs US) - however I just emailed via the help function on the Marriott website. They said I could be switched no problem to the 60k offer - but to contact them after the promo finished....
Could just be pot luck with who picks up your query..
By' eck - are you sure you're a brummy? very much tyke vernacular that (just to confuse our American bretheren ;-) )