weight isn't the only consideration as you could be low fat to muscle mass ratio and weigh quite a bit above the recommended range or be well within and look quite plump with a high fat to muscle proportion, most of the scales would give a range of high 9s ie 9st 11ish to low 12s but you could look great if well toned well into the 13s probably still in a size 12-14 BMI may be a better guide but even that has its critics....the best guide is a full length mirror...if you jump up and down and not much wobbles (except your boobs) you are probably pretty much ok