Thanks for the advice NoteNut,
Im 5 stays away from Diamond Status so unlikely i'll get there as well in the short time this year. I was happy with the room I booked and only got me thinking once they offered me the upgrade opportunity, I've been lucky enough to stay at W=A twice before and got upgrades on both occaisons, so hotel probably wasn't that busy when i went. We won't be checking in until late as well, so that may also be a factor.