Latest weight!!!!

Since 11th September I have been using Weightwatchers to reduce my body weight and bring my BMI under 30
Today was the weigh in with Public Health staff and this shows I am now under 95 kilo's less than 15 stone close to 3 stone lighter!!!!!! The BMI reading is 29.9.....

Question is how much further should I go and how will I ensure it does not go back on!!!!!!!!