Thank you everyone, well somehow I managed to sts so I'm happy with that.
Now this may sound odd but I am fully expecting the meeting scales to weigh more than mine (never met any slimming club scales that didn't) so I am inclined to think don't follow WW to the letter but just be sensible and at least that way it will feel deserved if I am told I weigh more than I thought on Monday. I just feel that pyschologically, if I've been really good this week and then put on simply due to different scales it will demotivate me before I've even begun.