Angelcake - Here are the points guidelines for you to work out your points:
Female - 3 points
Breastfeeding? No = 0 points, exclusively = 10 points, breastfeeding and weaning = 5 points
Age - 16-20 = 5, 21-35 = 4, 36-50 = 3, 51-65 = 2, over 65 = 1
Weight - You are allowed one point for every stone of weight (dont include the pounds). So, as you weigh 20 stone, you are allowed 20 points.
Height - Under 5'4" = 1, over 5'4" = 2.
Day to day life - Sitting down most of the time = 0, ocassionally sitting down but mostly standing = 2, walking most of the time = 4, Doing physically hard work most of the time = 6.
So, working out from the above, i would say you are allowed 28 points. I have gone on the assumption that you are aged 21-35, are not breastfeeding and are sitting down most of the time and also are over 5'4" tall. Obviously adjust the points if i have got any of the info wrong.