thanks Both,
Ok, so no benefit in waiting to book as room upgrade is given at check in only.
Additionally, assuming i can save an additional 5% above the 5% i can already get (total 10%), i'd be saving an additional $90 with Accor plus, if i use my Wife's family address in Thailand i can get Accor plus for ~$290 aud. Assuming i am able to use the free night (~$200) then i'd be breaking even before using other benefits such a food & drink discounts.
now to decide what to do, Accor plus or not